1H-pyrrolo[3,4-D]pyrimidin-2(6H)-one compounds

ABSTRACT

Optionally substituted (5- or 7-amino)-3,4-dihydro-(optionally 4-oxo, 4-thioxo or 4-imino)-1H-pyrrolo[3,4-d]pyrimidin-2(6H)-ones, Compounds of Formula I, processes for their production, their use as pharmaceuticals and pharmaceutical compositions comprising them.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a United States Application under 35 U.S.C. 371 claiming benefit of PCT Application No. PCT/US2009/006437, filed on Dec. 7, 2009, which claims the benefit of U.S. Provisional Application Nos. 61/120,443, filed on Dec. 6, 2008, and 61/235,888 filed on Aug. 21, 2009, respectively, the contents of each of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates optionally substituted (5- or 7-amino)-3,4-dihydro-(optionally 4-oxo, 4-thioxo or 4-imino)-1H-pyrrolo[3,4-d]pyrimidin-2(6H)-ones, preferably a compound of Formula I as described below, processes for their production, their use as pharmaceuticals and pharmaceutical compositions comprising them. Of particular interest are novel compounds useful as inhibitors of phosphodiesterase 1 (PDE1), e.g., in the treatment of diseases involving disorders of the dopamine D1 receptor intracellular pathway, such as Parkinson's disease, depression, narcolepsy, damage to cognitive function, e.g., in schizophrenia, or disorders that may be ameliorated through enhanced progesterone-signaling pathway, e.g., female sexual dysfunction.

BACKGROUND OF THE INVENTION

Eleven families of phosphodiesterases (PDEs) have been identified but only PDEs in Family I, the Ca²⁺-calmodulin-dependent phosphodiesterases (CaM-PDEs), have been shown to mediate both the calcium and cyclic nucleotide (e.g. cAMP and cGMP) signaling pathways. The three known CaM-PDE genes, PDE1A, PDE1B, and PDE1C, are all expressed in central nervous system tissue. PDE1A is expressed throughout the brain with higher levels of expression in the CA1 to CA3 layers of the hippocampus and cerebellum and at a low level in the striatum. PDE1A is also expressed in the lung and heart. PDE1B is predominately expressed in the striatum, dentate gyrus, olfactory tract and cerebellum, and its expression correlates with brain regions having high levels of dopaminergic innervation. Although PDE1B is primarily expressed in the central nervous system, it may be detected in the heart. PDE1C is primarily expressed in olfactory epithelium, cerebellar granule cells, and striatum. PDE1C is also expressed in the heart and vascular smooth muscle.

Cyclic nucleotide phosphodiesterases decrease intracellular cAMP and cGMP signaling by hydrolyzing these cyclic nucleotides to their respective inactive 5′-monophosphates (5′AMP and 5′GMP). CaM-PDEs play a critical role in mediating signal transduction in brain cells, particularly within an area of the brain known as the basal ganglia or striatum. For example, NMDA-type glutamate receptor activation and/or dopamine D2 receptor activation result in increased intracellular calcium concentrations, leading to activation of effectors such as calmodulin-dependent kinase II (CaMKII) and calcineurin and to activation of CaM-PDEs, resulting in reduced cAMP and cGMP. Dopamine D1 receptor activation, on the other hand, leads to activation of nucleotide cyclases, resulting in increased cAMP and cGMP. These cyclic nucleotides in turn activate protein kinase A (PKA; cAMP-dependent protein kinase) and/or protein kinase G (PKG; cGMP-dependent protein kinase) that phosphorylate downstream signal transduction pathway elements such as DARPP-32 (dopamine and cAMP-regulated phosphoprotein) and cAMP responsive element binding protein (CREB). Phosphorylated DARPP-32 in turn inhibits the activity of protein phosphates-1 (PP-1), thereby increasing the state of phosphorylation of substrate proteins such as progesterone receptor (PR), leading to induction of physiologic responses. Studies in rodents have suggested that inducing cAMP and cGMP synthesis through activation of dopamine D1 or progesterone receptor enhances progesterone signaling associated with various physiological responses, including the lordosis response associated with receptivity to mating in some rodents. See Mani, et al., Science (2000) 287: 1053, the contents of which are incorporated herein by reference.

CaM-PDEs can therefore affect dopamine-regulated and other intracellular signaling pathways in the basal ganglia (striatum), including but not limited to nitric oxide, noradrenergic, neurotensin, CCK, VIP, serotonin, glutamate (e.g., NMDA receptor, AMPA receptor), GABA, acetylcholine, adenosine (e.g., A2A receptor), cannabinoid receptor, natriuretic peptide (e.g., ANP, BNP, CNP), DARPP-32, and endorphin intracellular signaling pathways.

Phosphodiesterase (PDE) activity, in particular, phosphodiesterase 1 (PDE1) activity, functions in brain tissue as a regulator of locomotor activity and learning and memory. PDE1 is a therapeutic target for regulation of intracellular signaling pathways, preferably in the nervous system, including but not limited to a dopamine D1 receptor, dopamine D2 receptor, nitric oxide, noradrenergic, neurotensin, CCK, VIP, serotonin, glutamate (e.g., NMDA receptor, AMPA receptor), GABA, acetylcholine, adenosine (e.g., A2A receptor), cannabinoid receptor, natriuretic peptide (e.g., ANP, BNP, CNP), endorphin intracellular signaling pathway and progesterone signaling pathway. For example, inhibition of PDE1B should act to potentiate the effect of a dopamine D1 agonist by protecting cGMP and cAMP from degradation, and should similarly inhibit dopamine D2 receptor signaling pathways, by inhibiting PDE1 activity. Chronic elevation in intracellular calcium levels is linked to cell death in numerous disorders, particularly in neurodegerative diseases such as Alzheimer's, Parkinson's and Huntington's Diseases and in disorders of the circulatory system leading to stroke and myocardial infarction. PDE1 inhibitors are therefore potentially useful in diseases characterized by reduced dopamine D1 receptor signaling activity, such as Parkinson's disease, restless leg syndrome, depression, narcolepsy and cognitive impairment. PDE1 inhibitors are also useful in diseases that may be alleviated by the enhancement of progesterone-signaling such as female sexual dysfunction.

There is thus a need for compounds that selectively inhibit PDE1 activity, especially PDE1A or PDE1B activity.

SUMMARY OF THE INVENTION

The invention provides optionally substituted (5- or 7-amino)-3,4-dihydro-(optionally 4-oxo, 4-thioxo or 4-imino)-1H-pyrrolo[3,4-d]pyrimidin-2(6H)-ones, preferably a Compound of Formula II, e.g., II-A and II-B:

wherein

-   -   (i) is —C(═S)—, —C(═N(R₇))— or —C(R₁₄)(R₁₅)—;     -   (ii) R₁ is H or C₁₋₆alkyl (e.g., methyl or ethyl);     -   (iii) R₂ is         -   H,         -   C₁₋₆alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,             2,2-dimethylpropyl) wherein said alkyl group is optionally             substituted with halo (e.g., fluoro) or hydroxy (e.g.,             1-hydroxypropan-2-yl, 3-hydroxy-2-methylpropyl), for             example, R₂ may be a trifluoromethyl or             2,2,2-trifluoroethyl,         -   N(R₁₄)(R₁₅)—C₁₋₆alkyl (e.g., 2-(dimethylamino)ethyl or             2-aminopropyl),         -   arylC₀₋₆alkyl (e.g., phenyl or benzyl),         -   heteroarylC₀₋₆alkyl (e.g., pyridinylmethyl),         -   C₁₋₆alkoxyarylC₁₋₆alkyl (e.g., 4-methoxybenzyl);         -   -G-J wherein:             -   G is a single bond or, alkylene (e.g., methylene);             -   J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl,                 pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted                 with one or more C₁₋₆alkyl (e.g.,                 (1-methylpyrolidin-2-yl)), amino (e.g., —NH₂),             -   for example, -G-J may be —C₀₋₄alkyl-C₃₋₈cycloalkyl                 (e.g., cyclopentyl, cyclohexyl or cyclopropylmethyl)                 optionally substituted with one or more C₁₋₆alkyl, amino                 (e.g., —NH₂), for example, 2-aminocyclopentyl or                 2-aminocyclohexyl, wherein said cycloalkyl optionally                 contains one or more heteroatom selected from N and O                 (e.g., pyrrolidinyl, for example, pyrrolidin-3-yl or                 pyrrolidin-2-yl, 1-methyl-pyrrolindin-2-yl,                 1-methyl-pyrrolindin-3-yl,                 1-methyl-pyrrolindin-2-yl-methyl or                 1-methyl-pyrrolindin-3-yl-methyl);     -   (iv) R₃ is         -   1) -D-E-F wherein:             -   D is a single bond, C₁₋₆alkylene (e.g., methylene), or                 arylalkylene (e.g., p-benzylene or —CH₂C₆H₄—);             -   E is                 -   a single bond,                 -   C₁₋₄alkylene (e.g., methylene)                 -   C₂₋₆alkynylene (e.g., ethynylene,                     prop-2-yn-1-ylene), ethynylene, prop-2-yn-1-ylene),                 -   —C₀₋₄alkylarylene (e.g., phenylene or —C₆H₄—,                     -benzylene- or —CH₂C₆H₄—), wherein the arylene group                     is optionally substituted with halo (e.g., Cl or F),                 -   heteroarylene (e.g., pyridinylene or                     pyrimidinylene),                 -   aminoC₁₋₆alkylene (e.g., —CH₂N(H)—),                 -   amino (e.g., —N(H)—);                 -   C₃₋₈cycloalkylene optionally containing one or more                     heteroatom selected from N or O (e.g.,                     piperidinylene),             -   F is                 -   H,                 -   halo (e.g., F, Br, Cl),                 -   C₁₋₆alkyl (e.g., isopropyl or isobutyl),                 -   haloC₁₋₆alkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl),                 -   C₃₋₈cycloalkyl optionally containing at least one                     atom selected from a group consisting of N or O                     (e.g., cyclopentyl, cyclohexyl, piperidinyl,                     pyrrolidinyl, tetrahydro-2H-pyran-4-yl, or                     morpholinyl), said cycloalkyl is optionally                     substituted with C₁₋₆alkyl (e.g., methyl or                     isopropyl), for example, 1-methylpyrrolidin-2-yl,                     pyrrolidin-1-yl, pyrrolidin-2-yl, piperidin-2-yl,                     1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl,                 -   heteroaryl optionally substituted with C₁₋₆alkyl,                     (e.g., pyridyl, (for example, pyrid-2-yl),                     pyrimidinyl (for example, pyrimidin-2-yl),                     thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl),                     diazolyl (e.g., pyrazolyl (for example,                     pyrazol-1-yl) or imidazolyl (for example,                     imidazol-1-yl, 4-methylimidazolyl,                     1-methylimidazol-2-yl,), triazolyl (e.g.,                     1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), alkoxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                     pyrazol-1-yl), wherein said heteroaryl is optionally                     substituted with halo (e.g., fluoro) or                     haloC₁₋₆alkyl, for example, 6-fluoropyrid-2-yl;                 -   amino (e.g., —NH₂),                 -   C₁₋₆alkoxy,                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),                 -   C₁₋₆alkylsulfonyl (for example, methylsulfonyl or                     —S(O)₂CH₃),                 -   —C(O)—R₁₃,                 -   —N(R₁₄)(R₁₅); or         -   2) a substituted heteroarylaklyl, e.g., substituted with             haloalkyl; or         -   3) attached to the nitrogen on the pyrrolo portion of             Formula I and is a moiety of Formula A

-   -   -   -   wherein X, Y and Z are, independently, N or C, and R₈,                 R₉, R₁₁ and R₁₂ are independently H or halogen (e.g., Cl                 or F); and R₁₀ is                 -   halogen,                 -   C₁₋₆alkyl,                 -   C₁₋₆alkoxy (e.g., methoxy),                 -   C₃₋₈cycloalkyl,                 -   heteroC₃₋₈cycloalkyl (e.g., pyrrolidinyl)                 -   haloC₁₋₆alkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl),                 -   heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl)                     or e.g., thiadiazolyl (for example,                     1,2,3-thiadiazol-4-yl), diazolyl (e.g., imidazolyl                     or pyrazolyl), triazolyl (e.g., 1,2,4-triazol-1-yl),                     tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl                     (e.g., 5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                     pyrazol-1-yl),                 -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   alkoxycarbonyl, (e.g., methoxycarbonyl),                 -   aminocarbonyl;                 -   wherein the aryl, heteroaryl, cycloalkyl or                     heterocycloalkyl is optionally substituted with one                     or more C₁₋₆alkyl (e.g., methyl), halogen (e.g.,                     chloro or fluoro), haloC₁₋₆alkyl (e.g.,                     trifluoromethyl), hydroxy, carboxy, —SH, or an                     additional aryl or heteroaryl (e.g., biphenyl or                     pyridylphenyl)                 -   preferably R₁₀ is phenyl or pyridyl, e.g., 2-pyridyl                     optionally substituted with the substituents                     previously defined;                 -   provided that when X, Y or X is nitrogen, R₈, R₉ or                     R₁₀, respectively, is not present;

    -   (v) R₄ and R₅ are independently         -   H,         -   C₁₋₆alkyl (e.g., methyl, isopropyl),         -   C₃₋₈cycloalkyl (e.g., cyclopentyl),         -   C₃₋₈heterocycloalkyl (e.g., pyrrolidin-3-yl),         -   aryl (e.g., phenyl) or         -   heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl)         -   wherein said aryl or heteroaryl is optionally substituted             with halo (e.g., 4-fluorophenyl), hydroxy (e.g.,             4-hydroxyphenyl), C₁₋₆alkyl, C₁₋₆alkoxy or another aryl             group (e.g., biphenyl-4-ylmethyl);

    -   (vi) R₆ is H, C₁₋₆alkyl (e.g., methyl), hydroxy, C₁₋₆alkoxy,         aryloxy, —N(R₁₆)(R₁₇), oxo (e.g., ═O), or C₃₋₈cycloalkyl;

    -   (vii) R₇ is H, C₁₋₆alkyl (e.g., methyl) or C₃₋₈cycloalkyl         wherein said cycloalkyl is optionally substituted with one or         more oxo (e.g., 2,5-dioxopyrrolidin-1-yl);

    -   (viii) R₁₃ is —N(R₁₄)(R₁₅), C₁₋₆alkyl (e.g., methyl),         —OC₁₋₆alkyl (e.g., —OCH₃), haloC₁₋₆alkyl (trifluoromethyl), aryl         (e.g., phenyl), or heteroaryl; and

    -   (ix) R₁₄ and R₁₅ are independently H or C₁₋₆alkyl;

    -   (x) R₁₆ and R₁₇ are independently H, C₁₋₆alkyl, aryl (e.g.,         phenyl), heteroaryl, wherein said aryl or heteroaryl is         optionally substituted with halo (e.g., fluoro), C₁₋₆alkoxy         (e.g., methoxy);         in free or salt form.

Compounds of Formula I, e.g. Formula I-A and I-B:

wherein

-   -   (i) Q is —C(═S)—, —C(═O)—, —C(═N(R₆))— or —C(R₁₄)(R₁₅)—;     -   (ii) R₁ is H or C₁₋₆alkyl (e.g., methyl or ethyl);     -   (iii) R₂ is         -   H,         -   C₁₋₆alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,             2,2-dimethylpropyl) wherein said alkyl group is optionally             substituted with halo (e.g., fluoro) or hydroxy (e.g.,             1-hydroxypropan-2-yl, 3-hydroxy-2-methylpropyl),         -   —C₀₋₄alkyl-C₃₋₈cycloalkyl (e.g., cyclopentyl, cyclohexyl)             optionally substituted with one or more amino (e.g., —NH₂),             for example, 2-aminocyclopentyl or 2-aminocyclohexyl),             wherein said cycloalkyl optionally contains one or more             heteroatom selected from N and O and is optionally             substituted with C₁₋₆alkyl (e.g., 1-methyl-pyrrolindin-2-yl,             1-methyl-pyrrolindin-3-yl, 1-methyl-pyrrolindin-2-yl-methyl             or 1-methyl-pyrrolindin-3-yl-methyl),         -   C₃₋₈heterocycloalkyl (e.g., pyrrolidinyl, for example,             pyrrolidin-3-yl or pyrrolidin-2-yl) optionally substituted             with C₁₋₆alkyl (e.g., methyl), for example,             1-methylpyrrolidin-3-yl or 1-methylpyrrolidin-2-yl,         -   C₃₋₈cycloalkyl-C₁₋₆alkyl (e.g., cyclopropylmethyl),         -   haloC₁₋₆alkyl (e.g., trifluoromethyl, 2,2,2-trifluoroethyl),         -   —N(R₁₄)(R₁₅)—C₁₋₆alkyl (e.g.,             2-(dimethylamino)ethyl,2-aminopropyl),         -   hydroxyC₁₋₆alkyl (e.g., (e.g., 3-hydroxy-2-methylpropyl,             1-hydroxyprop-2-yl),         -   arylC₀₋₆alkyl (e.g., benzyl),         -   heteroarylC₁₋₆alkyl (e.g., pyridinylmethyl),         -   C₁₋₆alkoxyarylC₁₋₆alkyl (e.g., 4-methoxybenzyl);         -   -G-J wherein:             -   G is a single bond or, alkylene (e.g., methylene);             -   J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl,                 pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted                 with C₁₋₆alkyl (e.g., (1-methylpyrolidin-2-yl));     -   (iv) R₃ is         -   1) -D-E-F wherein:             -   D is a single bond, C₁₋₆alkylene (e.g., methylene), or                 arylalkylene (e.g., p-benzylene or —CH₂C₆H₄—);             -   E is                 -   a single bond,                 -   C₁₋₄alkylene (e.g., methylene)                 -   C₂₋₆alkynylene (e.g., ethynylene,                     prop-2-yn-1-ylene), ethynylene, prop-2-yn-1-ylene),                 -   —C₀₋₄alkylarylene (e.g., phenylene or —C₆H₄—,                     -benzylene- or —CH₂C₆H₄—), wherein the arylene group                     is optionally substituted with halo (e.g., Cl or F),                 -   heteroarylene (e.g., pyridinylene or                     pyrimidinylene),                 -   aminoC₁₋₆alkylene (e.g., —CH₂N(H)—),                 -   amino (e.g., —N(H)—);                 -   C₃₋₈cycloalkylene optionally containing one or more                     heteroatom selected from N or O (e.g.,                     piperidinylene),             -   F is                 -   H,                 -   halo (e.g., F, Br, Cl),                 -   C₁₋₆alkyl (e.g., isopropyl or isobutyl),                 -   haloC₁₋₆alkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl),                 -   C₃₋₈cycloalkyl optionally containing at least one                     atom selected from a group consisting of N or O                     (e.g., cyclopentyl, cyclohexyl, piperidinyl,                     pyrrolidinyl, tetrahydro-2H-pyran-4-yl, or                     morpholinyl), said cycloalkyl is optionally                     substituted with C₁₋₆alkyl (e.g., methyl or                     isopropyl), for example, 1-methylpyrrolidin-2-yl,                     pyrrolidin-1-yl, pyrrolidin-2-yl, piperidin-2-yl,                     1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl,                 -   heteroaryl optionally substituted with C₁₋₆alkyl,                     (e.g., pyridyl, (for example, pyrid-2-yl),                     pyrimidinyl (for example, pyrimidin-2-yl),                     thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl),                     diazolyl (e.g., pyrazolyl (for example,                     pyrazol-1-yl) or imidazolyl (for example,                     imidazol-1-yl, 4-methylimidazolyl,                     1-methylimidazol-2-yl,), triazolyl (e.g.,                     1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), alkoxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                     pyrazol-1-yl), wherein said heteroaryl is optionally                     substituted with halo (e.g., fluoro) or                     haloC₁₋₆alkyl, for example, 6-fluoropyrid-2-yl;                     amino (e.g., —NH₂),                 -   C₁₋₆alkoxy,                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),                 -   C₁₋₆alkylsulfonyl (for example, methylsulfonyl or                     —S(O)₂CH₃),                 -   —C(O)—R₁₃,                 -   —N(R₁₄)(R₁₅); or         -   2) a substituted heteroarylaklyl, e.g., substituted with             haloalkyl; or         -   3) attached to the nitrogen on the pyrrolo portion of             Formula I and is             -   a moiety of Formula A

-   -   -   -   wherein X, Y and Z are, independently, N or C, and R₈,                 R₉, R₁₁ and R₁₂ are independently H or halogen (e.g., Cl                 or F); and R₁₀ is halogen, alkyl, cycloalkyl, haloalkyl                 (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl                 (e.g., pyridyl, (for example, pyrid-2-yl) or e.g.,                 thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl),                 diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl),                 tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g.,                 5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                 pyrazol-1-yl), alkyl sulfonyl (e.g., methyl sulfonyl),                 arylcarbonyl (e.g., benzoyl), or heteroarylcarbonyl,                 alkoxycarbonyl, (e.g., methoxycarbonyl), aminocarbonyl;                 preferably phenyl or pyridyl, e.g., 2-pyridyl; provided                 that when X, Y or X is nitrogen, R₈, R₉ or R₁₀,                 respectively, is not present;

    -   (v) R₄ and R₅ are independently         -   H,         -   C₁₋₆alkyl (e.g., methyl, isopropyl),         -   C₃₋₈cycloalkyl (e.g., cyclopentyl),         -   C₃₋₈heterocycloalkyl (e.g., pyrrolidin-3-yl),         -   aryl (e.g., phenyl) or heteroaryl (e.g., pyrid-4-yl,             pyrid-2-yl or pyrazol-3-yl) wherein said aryl or heteroaryl             is optionally substituted with halo (e.g., 4-fluorophenyl),             hydroxy (e.g., 4-hydroxyphenyl), C₁₋₆alkyl, C₁₋₆alkoxy or             another aryl group (e.g., biphenyl-4-ylmethyl);

    -   (vi) R₆ is H, C₁₋₆alkyl (e.g., methyl) or C₃₋₈cycloalkyl;

    -   (vii) R₁₃ is —N(R₁₄)(R₁₅), C₁₋₆alkyl (e.g., methyl), —OC₁₋₆alkyl         (e.g., —OCH₃), haloC₁₋₆alkyl (trifluoromethyl), aryl (e.g.,         phenyl), or heteroaryl; and

    -   (viii) R₁₄ and R₁₅ are independently H or C₁₋₆alkyl, in free or         salt form.

In a further embodiment, the compound of formula I is a compound wherein Q is C(═O) or C(═S) and R₆ is H or C₁₋₆alkyl, in free or salt form. In still another embodiment, the compound of formula II is a compound wherein Q is C(═O) or C(═S) and R₆ is H, C₁₋₆alkyl (e.g., methyl), hydroxy, C₁₋₆alkoxy, aryloxy, —N(R₁₆)(R₁₇), oxo (e.g., ═O), or C₃₋₈cycloalkyl, in free or salt form.

The invention further provides compounds of Formula I (I-A and I-B) as follows:

-   -   1.1 Formula I, wherein Q is —C(═S)—;     -   1.2 Formula I, wherein Q is —C(═N(R₆))—;     -   1.3 Formula I, wherein Q is —C(R₁₄)(R₁₅)—;     -   1.4 Formula I, or any of 1.1-1.3, wherein R₃ is -D-E-F;     -   1.5 Formula 1.4, D is a single bond, C₁₋₆alkylene (e.g.,         methylene), or arylalkylene (e.g., benzylene or —CH₂C₆H₄—);     -   1.6 Formula 1.4, wherein D is a single bond;     -   1.7 Formula 1.4, wherein D is C₁₋₆alkylene (e.g., methylene);     -   1.8 Formula 1.4, wherein D is methylene;     -   1.9 Formula 1.4, wherein D is arylalkylene (e.g., benzylene or         —CH₂C₆H₄—);     -   1.10 Formula 1.4, wherein D is benzylene or —CH₂C₆H₄—;     -   1.11 Any of formulae 1.4-1.10, wherein E is a single bond,         C₁₋₆alkylene (e.g., methylene), C₂₋₆alkynylene (e.g.,         ethynylene, prop-2-yn-1-ylene), —C₀₋₄alkylarylene (e.g.,         phenylene or —C₆H₁₄—, -benzylene- or —CH₂C₆H₄—), wherein the         arylene group is optionally substituted with halo (e.g., Cl or         F), heteroarylene (e.g., pyridinylene or pyrimidinylene),         aminoC₁₋₆alkylene (e.g., —CH₂N(H)—), amino (e.g., —N(H)—);         C₃₋₈cycloalkylene optionally containing one or more heteroatom         selected from N or O (e.g., piperidinylene);     -   1.12 Any of formulae 1.4-1.10, wherein E is a single bond;     -   1.13 Any of formulae 1.4-1.10, wherein E is C₁₋₆alkylene (e.g.,         methylene);     -   1.14 Any of formulae 1.4-1.10, wherein E is C₂₋₆alkynylene         (e.g., ethynylene, prop-2-yn-1-ylene);     -   1.15 Any of formulae 1.4-1.10, wherein E is methylene;     -   1.16 Any of formulae 1.4-1.10, wherein E is ethynylene;     -   1.17 Any of formulae 1.4-1.10, wherein E is prop-2-yn-1-ylene;     -   1.18 Any of formulae 1.4-1.10, wherein E is —C₀₋₄alkylarylene         (e.g., phenylene or —C₆H₄—, -benzylene- or —CH₂C₆H₄—), wherein         the arylene group is optionally substituted with halo (e.g., Cl         or F);     -   1.19 Any of formulae 1.4-1.10, wherein E is phenylene or —C₆H₄—;     -   1.20 Any of formulae 1.4-1.10, wherein E is heteroarylene (e.g.,         pyridylene or pyrimidylene);     -   1.21 Any of formulae 1.4-1.10, wherein E is pyridylene;     -   1.22 Any of formulae 1.4-1.10, wherein E is pyrimidylene;     -   1.23 Any of formulae 1.4-1.10, wherein E is aminoC₁₋₆alkylene         (e.g., —CH₂N(H)—);     -   1.24 Any of formulae 1.4-1.10, wherein E is amino (e.g.,         —N(H)—);     -   1.25 Any of formulae 1.4-1.10, wherein E is C₃₋₈cycloalkylene         optionally containing one or more heteroatom selected from N or         O (e.g., piperidinylene);     -   1.26 Any of formulae 1.4-1.25, wherein F is H, halo (e.g., F,         Br, Cl), C₁₋₆alkyl (e.g., isopropyl or isobutyl), haloC₁₋₆alkyl         (e.g., trifluoromethyl), aryl (e.g., phenyl), C₃₋₈cycloalkyl         optionally containing at least one atom selected from a group         consisting of N or O (e.g., cyclopentyl, cyclohexyl,         piperidinyl, pyrrolidinyl, tetrahydro-2H-pyran-4-yl, or         morpholinyl), said cycloalkyl is optionally substituted with         C₁₋₆alkyl (e.g., methyl or isopropyl), for example,         1-methylpyrrolidin-2-yl, pyrrolidin-1-yl, pyrrolidin-2-yl,         piperidin-2-yl, 1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;         heteroaryl optionally substituted with C₁₋₆alkyl (e.g., pyridyl,         (for example, pyrid-2-yl), pyrimidinyl (for example,         pyrimidin-2-yl), thiadiazolyl (for example,         1,2,3-thiadiazol-4-yl), diazolyl (e.g., pyrazolyl (for example,         pyrazol-1-yl) or imidazolyl (for example, imidazol-1-yl,         4-methylimidazolyl, 1-methylimidazol-2-yl,), triazolyl (e.g.,         1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl),         alkoxadiazolyl (e.g., 5-methyl-1,2,4-oxadiazol), pyrazolyl         (e.g., pyrazol-1-yl), wherein said heteroaryl is optionally         substituted with halo (e.g., fluoro) or haloC₁₋₆alkyl, for         example, 6-fluoropyrid-2-yl; amino (e.g., —NH₂), C₁₋₆alkoxy,         —O-haloC₁₋₆alkyl (e.g., —O—CF₃), C₁₋₆alkylsulfonyl (for example,         methylsulfonyl or —S(O)₂CH₃), C(O)—R₁₃ or —N(R₁₄)(R₁₅);     -   1.27 Any of formulae 1.4-1.26, wherein F is H;     -   1.28 Any of formulae 1.4-1.26, wherein F is halo (e.g., F, Br,         Cl);     -   1.29 Any of formulae 1.4-1.26, wherein F is fluoro or chloro;     -   1.30 Any of formulae 1.4-1.26, wherein F is C₁₋₆alkyl (e.g.,         isopropyl or isobutyl);     -   1.31 Any of formulae 1.4-1.26, wherein F is isopropyl;     -   1.32 Any of formulae 1.4-1.26, wherein F is isobutyl;     -   1.33 Any of formulae 1.4-1.26, wherein F is haloC₁₋₆alkyl (e.g.,         trifluoromethyl);     -   1.34 Any of formulae 1.4-1.26, wherein F is trifluoromethyl;     -   1.35 Any of formulae 1.4-1.26, wherein F is aryl (e.g., phenyl);     -   1.36 Any of formulae 1.4-1.26, wherein F is phenyl;     -   1.37 Any of formulae 1.4-1.26, wherein F is C₃₋₈cycloalkyl         optionally containing at least one atom selected from a group         consisting of N or O (e.g., cyclopentyl, cyclohexyl,         piperidinyl, pyrrolidinyl tetrahydro-2H-pyran-4-yl,         morpholinyl); and optionally substituted with C₁₋₆alkyl (e.g.,         methyl or isopropyl), for example, 1-methylpyrrolidin-2-yl,),         for example, 1-methylpyrrolidin-2-yl, pyrrolidin-1-yl,         pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl, piperidin-2-yl,         1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;     -   1.38 Any of formulae 1.4-1.26, wherein F is cyclopentyl or         cyclohexyl;     -   1.39 Any of formulae 1.4-1.26, wherein F is         1-methylpyrrolidin-2-yl;     -   1.40 Any of formulae 1.4-1.26, wherein F is heteroaryl         optionally substituted with C₁₋₆alkyl (e.g., pyridyl, (for         example, pyrid-2-yl), pyrimidinyl (for example, pyrimidin-2-yl),         thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl), diazolyl         (e.g., pyrazolyl (for example, pyrazol-1-yl) or imidazolyl (for         example, imidazol-1-yl, 4-methylimidazolyl,         1-methylimidazol-2-yl,), triazolyl (e.g., 1,2,4-triazol-1-yl),         tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g.,         5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g., pyrazol-1-yl),         wherein said heteroaryl is optionally substituted with halo         (e.g., fluoro) or haloC₁₋₆alkyl;     -   1.41 Any of formulae 1.4-1.26, wherein F is pyrid-2-yl         optionally substituted with halo (e.g., fluoro);     -   1.42 Any of formulae 1.4-1.26, wherein F is 6-fluoro-pyrid-2-yl;     -   1.43 Any of formulae 1.4-1.26, wherein F is pyrimidinyl (for         example, pyrimidin-2-yl);     -   1.44 Any of formulae 1.4-1.26, wherein F is pyrazolyl (e.g.,         pyrazol-1-yl);     -   1.45 Any of formulae 1.4-1.26, wherein F is triazolyl (e.g.,         1,2,4-triazol-1-yl);     -   1.46 Any of formulae 1.4-1.26, wherein F is diazolyl (e.g.,         pyrazolyl (for example, pyrazol-1-yl) or imidazolyl (for         example, imidazol-1-yl, 4-methylimidazolyl,         1-methylimidazol-2-yl,);     -   1.47 Any of formulae 1.4-1.26, wherein F is         C-₁₋₆alkyl-oxadiazolyl (e.g., 5-methyl-1,2,4-oxadiazolyl);     -   1.48 Any of formulae 1.4-1.26, wherein F is amino (e.g., —NH₂);     -   1.49 Any of formulae 1.4-1.26, wherein F is C₁₋₆alkoxy;     -   1.50 Any of formulae 1.4-1.26, wherein F is —O-haloC₁₋₆alkyl         (e.g., —O—CF₃);     -   1.51 Any of formulae 1.1-1.26, wherein F is —C(O)—R₁₃;     -   1.52 Any of formulae 1.1-1.26, wherein F is —N(R₁₄)(R₁₅);     -   1.53 Any of formulae 1.1-1.26, wherein F is C₁₋₆alkylsulfonyl;     -   1.54 Any of formulae 1.1-1.26, wherein F is methylsulfonyl or         —S(O)₂CH₃;     -   1.55 Formula I or any of 1.1-1.25, wherein R₃ is a substituted         heteroarylaklyl, e.g., substituted with haloalkyl;     -   1.56 Formula I or any of 1.1-1.25, wherein R₃ is attached to the         nitrogen on the pyrrolo portion of Formula I and is a moiety of         Formula A

-   -   -   wherein X, Y and Z are, independently, N or C, and R₈, R₉,             R₁₁ and R₁₂ are independently H or halogen (e.g., Cl or F);             and R₁₀ is halogen, alkyl, cycloalkyl, haloalkyl (e.g.,             trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g.,             pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl             (for example, 1,2,3-thiadiazol-4-yl), diazolyl, triazolyl             (e.g., 1,2,4-triazol-1-yl), tetrazolyl (e.g.,             tetrazol-5-yl), alkoxadiazolyl (e.g.,             5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g., pyrazol-1-yl),             alkyl sulfonyl (e.g., methyl sulfonyl), arylcarbonyl (e.g.,             benzoyl), or heteroarylcarbonyl, alkoxycarbonyl, (e.g.,             methoxycarbonyl), aminocarbonyl; preferably phenyl or             pyridyl, e.g., 2-pyridyl; provided that when X, Y or X is             nitrogen, R₈, R₉ or R₁₀, respectively, is not present;

    -   1.57 Formula 1.56, wherein R₃ is a moiety of Formula A, R₈, R₉,         R₁₁ and R₁₂ are each H and R₁₀ is phenyl;

    -   1.58 Formula 1.56, wherein R₃ is a moiety of Formula A, R₈, R₉,         R₁₁ and R₁₂ are each H and R₁₀ is pyridyl or thiadizolyl;

    -   1.59 Formula 1.56, wherein R₃ is a moiety of Formula A, R₈, R₉,         R₁₁ and R₁₂ are each H and R₁₀ is pyrid-2-yl optionally         substituted with halo (e.g., fluoro);

    -   1.60 Formula 1.56, wherein R₃ is a moiety of Formula A and X, Y         and Z are all C;

    -   1.61 Formula 1.56, wherein R₁₀ is pyrimidinyl;

    -   1.62 Formula 1.56, wherein R₁₀ is 5-fluoropyrmidinyl;

    -   1.63 Formula 1.56, wherein R₁₀ is pyrazol-1-yl;

    -   1.64 Formula 1.56, wherein R₁₀ is 1,2,4-triazol-1-yl;

    -   1.65 Formula 1.56, wherein R₁₀ is aminocarbonyl;

    -   1.66 Formula 1.56, wherein R₁₀ is methylsulfonyl;

    -   1.67 Formula 1.56, wherein R₁₀ is 5-methyl-1,2,4-oxadiazol-3-yl;

    -   1.68 Formula 1.56, wherein R₁₀ is 5-fluoropyrimidin-2-yl;

    -   1.69 Formula 1.56, wherein R₁₀ is trifluoromethyl;

    -   1.70 Formula 1.56, wherein R₃ is a moiety of Formula A, X and Z         are C, and Y is N;

    -   1.71 Formula I or any of 1.1-1.70, wherein R₂ is H; C₁₋₆alkyl         (e.g., isopropyl, isobutyl, neopentyl, 2-methylbutyl,         2,2-dimethylpropyl) wherein said alkyl group is optionally         substituted with halo (e.g., fluoro) or hydroxy (e.g.,         1-hydroxypropan-2-yl, 3-hydroxy-2-methylpropyl);         —O—C₀₋₄alkyl-C₃₋₈cycloalkyl (e.g., cyclopentyl, cyclohexyl)         wherein said cycloalkyl optionally contains one or more         heteroatom selected from N and O and said alkylcycloalkyl is         optionally substituted with one or more amine (e.g., —NH₂), for         example, 2-aminocyclopentyl or 2-aminocyclohexyl), C₁₋₆alkyl         (e.g., 1-methyl-pyrrolindin-2-yl, 1-methyl-pyrrolindin-3-yl,         1-methyl-pyrrolindin-2-yl-methyl or         1-methyl-pyrrolindin-3-yl-methyl); C₃₋₈heterocycloalkyl (e.g.,         pyrrolidinyl, for example, pyrrolidin-3-yl) optionally         substituted with C₁₋₆alkyl (e.g., methyl), for example,         1-methylpyrrolidin-3-yl; C₃₋₈cycloalkyl-C₁₋₆alkyl (e.g.,         cyclopropylmethyl); haloC₁₋₆alkyl (e.g., trifluoromethyl,         2,2,2-trifluoroethyl); —N(R₁₄)(R₁₅)—C₁₋₆alkyl (e.g.,         2-(dimethylamino)ethyl,2-aminopropyl); hydroxyC₁₋₆alkyl (e.g.,         (e.g., 3-hydroxy-2-methylpropyl, 1-hydroxyprop-2-yl);         arylC₀₋₆alkyl (e.g., benzyl); heteroarylC₁₋₆alkyl (e.g.,         pyridinylmethyl); C₁₋₆alkoxyarylC₁₋₆alkyl (e.g.,         4-methoxybenzyl); -G-J wherein: G is a single bond or, alkylene         (e.g., methylene) and J is cycloalkyl or heterocycloalkyl (e.g.,         oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl) optionally         substituted with C₁₋₆alkyl (e.g., (1-methylpyrolidin-2-yl));

    -   1.72 Formula 1.69, wherein R₂ is H;

    -   1.73 Formula 1.69, wherein R₂ is C₁₋₆alkyl (e.g., isopropyl,         isobutyl, neopentyl, 2-methylbutyl, 2,2-dimethylpropyl) wherein         said alkyl group is optionally substituted with halo (e.g.,         trifluoroethyl) or hydroxy (e.g., 1-hydroxypropan-2-yl,         3-hydroxy-2-methylpropyl);

    -   1.74 Formula 1.69, wherein R₂ is isobutyl;

    -   1.75 Formula 1.69, wherein R₂ is 3-hydroxy-2-methylpropyl;

    -   1.76 Formula 1.69, wherein R₂ is 1-hydroxypropan-2-yl;

    -   1.77 Formula 1.69, wherein R₂ is —C₀₋₄alkyl-C₃₋₈cycloalkyl         (e.g., cyclopentyl, cyclohexyl) wherein said cycloalkyl         optionally contains one or more heteroatom selected from N and O         and is optionally substituted with one or more amino (e.g.,         —NH₂), for example, 2-aminocyclopentyl or 2-aminocyclohexyl),         C₁₋₆alkyl (e.g., 1-methyl-pyrrolindin-2-yl,         1-methyl-pyrrolindin-3-yl, 1-methyl-pyrrolindin-2-yl-methyl or         1-methyl-pyrrolindin-3-yl-methyl);

    -   1.78 Formula 1.69, wherein R₂ is 1-methyl-pyrrolindin-2-yl,         1-methyl-pyrrolindin-3-yl, 1-methyl-pyrrolindin-2-yl-methyl or         1-methyl-pyrrolindin-3-yl-methyl;

    -   1.79 Formula 1.69, wherein R₂ is C₃₋₈heterocycloalkyl (e.g.,         pyrrolidinyl, for example, pyrrolidin-3-yl) optionally         substituted with C₁₋₆alkyl (e.g., methyl), for example,         1-methylpyrrolidin-3-yl or 1-methylpyrrolidin-2-yl;

    -   1.80 Formula 1.69, wherein R₂ is 1-methylpyrrolidin-3-yl;

    -   1.81 Formula 1.69, wherein R₂ is C₃₋₈cycloalkyl-C₁₋₆alkyl (e.g.,         cyclopropylmethyl);

    -   1.82 Formula 1.69, wherein R₂ is —NR₁₄)(R₁₅)—C₁₋₆alkyl (e.g.,         2-(dimethylamino)ethyl, 2-aminopropyl);

    -   1.83 Formula 1.69, wherein R₂ is heteroarylC₁₋₆alkyl (e.g.,         pyridinylmethyl),

    -   1.84 Formula 1.69, wherein R₂ is C₁₋₆alkoxyarylC₁₋₆alkyl (e.g.,         4-methoxybenzyl;

    -   1.85 Formula 1.69, wherein R₂ is arylC₀₋₆alkyl (e.g., benzyl);

    -   1.86 Formula 1.69, wherein R₂ is cyclopentyl or cyclohexyl;

    -   1.87 Formula I or any of 1.1-1.70, wherein R₂ is -G-J; G is a         single bond or, alkylene (e.g., methylene); and J is cycloalkyl         or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl,         pyrolyin-2-yl) optionally substituted with C₁₋₆alkyl (e.g.,         (1-methylpyrolidin-2-yl));

    -   1.88 Formula 1.87, wherein G is alkylene (e.g., methylene);

    -   1.89 Formula 1.87, wherein G is methylene;

    -   1.90 Formula 1.87, wherein J is cycloalkyl or heterocycloalkyl         (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl) optionally         substituted with alkyl (e.g., 1-methylpyrolidin-2-yl);

    -   1.91 Formula 1.87, wherein J is oxetan-2-yl, pyrolyin-3-yl,         pyrolyin-2-yl;

    -   1.92 Formula 1.87, wherein J is (1-methylpyrolidin-2-yl);

    -   1.93 Any of the preceding formulae wherein R₄ and R₅ are         independently H, C₁₋₆alkyl (e.g., methyl, isopropyl),         C₃₋₈cycloalkyl (e.g., cyclopentyl), C₃₋₈heterocycloalkyl (e.g.,         pyrrolidin-3-yl), or aryl (e.g., phenyl) or heteroaryl (e.g.,         pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) wherein said aryl or         heteroaryl is optionally substituted with halo (e.g.,         4-fluorophenyl), hydroxy (e.g., 4-hydroxyphenyl), C₁₋₆alkyl,         C₁₋₆alkoxy or another aryl group (e.g., biphenyl-4-ylmethyl);

    -   1.94 Formula 1.93, wherein either R₄ or R₅ is H;

    -   1.95 Formula 1.93, wherein either R₄ or R₅ is C₁₋₆alkyl (e.g.,         methyl, isopropyl);

    -   1.96 Formula 1.93, wherein either R₄ or R₅ is isopropyl;

    -   1.97 Formula 1.93, wherein either R₄ or R₅ is C₃₋₈cycloalkyl         (e.g., cyclopentyl);

    -   1.98 Formula 1.93, wherein either R₄ or R₅ is         C₃₋₈heterocycloalkyl (e.g., pyrrolidin-3-yl);

    -   1.99 Formula 1.93, wherein either R₄ or R₅ is aryl (e.g.,         phenyl) optionally substituted with halo (e.g., 4-fluorophenyl),         hydroxy (e.g., 4-hydroxyphenyl), C₁₋₆alkyl, C₁₋₆alkoxy or         another aryl group (e.g., biphenyl-4-ylmethyl);

    -   1.100 Formula 1.93, wherein either R₄ or R₅ is 4-hydroxyphenyl;

    -   1.101 Formula 1.93, wherein either R₄ or R₅ is 4-fluorophenyl;

    -   1.102 Formula 1.93, wherein either R₄ or R₅ is heteroaryl (e.g.,         pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) optionally substituted         with halo (e.g., 4-fluorophenyl), hydroxy (e.g.,         4-hydroxyphenyl), C₁₋₆alkyl, C₁₋₆alkoxy or another aryl group         (e.g., biphenyl-4-ylmethyl);

    -   1.103 Formula 1.93, wherein either R₄ or R₅ is phenyl;

    -   1.104 Any of the foregoing formulae, wherein R₆ is H, C₁₋₆alkyl         (e.g., methyl) or C₃₋₈cycloalkyl;

    -   1.105 Formula 1.104, wherein R₆ is H;

    -   1.106 Formula 1.104, wherein R₆ is C₁₋₆alkyl (e.g., methyl);

    -   1.107 Formula 1.104, wherein R₆ is methyl;

    -   1.108 Any of the foregoing formulae, wherein R¹³ is         —N(R₁₄)(R₁₅), C₁₋₆alkyl (e.g., methyl), —OC₁₋₆alkyl (e.g.,         —OCH₃), haloC₁₋₆alkyl, aryl (for example phenyl), or heteroaryl;

    -   1.109 Formula 1.108, wherein R¹³ is —N(R₁₄)(R₁₅) (e.g., —NH₁₂)

    -   1.110 Formula 1.108, wherein R¹³ is C₁₋₆alkyl (e.g., methyl);

    -   1.111 Formula 1.108, wherein R¹³ is —OC₁₋₆alkyl (e.g., —OCH₃),

    -   1.112 Formula 1.108, wherein R¹³ is —OCH₃;

    -   1.113 Formula 1.108, wherein R¹³ is haloC₁₋₆alkyl (e.g.,         trifluoromethyl);

    -   1.114 Formula 1.108, wherein R¹³ is trifluoromethyl;

    -   1.115 Formula 1.108, wherein R¹³ is aryl (e.g., phenyl);

    -   1.116 Formula 1.108, wherein R¹³ is heteroaryl (e.g., pyridiyl);

    -   1.117 Any of the preceding formulae, wherein R₁₄ and R₁₅ are         independently H or C₁₋₆alkyl (e.g., methyl);

    -   1.118 Formula I or any of 1.1-1.117, wherein either R₁₄ or R₁₅         is independently H;

    -   1.119 Formula I or any of 1.1-1.117, wherein either R₁₄ or R₁₅         is C₁₋₆alkyl (e.g., methyl);

    -   1.120 Formula I or any of 1.1-1.117, wherein either R₁₄ or R₁₅         is methyl;

    -   1.121 any of the preceding formulae wherein compound of formula         I is

-   -   1.122 any of the preceding formulae wherein compound of formula         I is

-   -   1.123 any of the preceding formulae wherein R₃ of formula I is         4-methoxybenzyl;     -   1.124 any of the preceding formulae wherein R₃ of formula I is         4-(6-fluoropyrid-2-yl)benzyl;     -   1.125 any of the preceding formulae wherein —N(R₄)(R₅) of         formula I is phenylamino, hydroxyphenylamino or         fluorophenylamino;     -   1.126 any of the preceding formulae wherein compound of formula         I is selected from a group consisting of:

-   -   1.127 any of the preceding formulae wherein the compounds         inhibit phosphodiesterase-mediated (e.g., PDE1-mediated,         especially PDE1B-mediated) hydrolysis of cGMP, e.g., with an         IC₅₀ of less than 25 μM, preferably less than 1 μM, preferably         less than 500 nM, preferably less than 200 nM in an         immobilized-metal affinity particle reagent PDE assay, for         example, as described in Example 23,     -   in free or salt form.

In a particular embodiment, the Compound of the Invention is a Compound of Formula I wherein Q is C(═O) or C(═S) and R₆ is H or C₁₋₆alkyl, in free or salt form.

In a particular embodiment, the Compound of the Invention is a Compound of Formula I wherein

-   -   (i) Q is —C(═S)—, —C(═O)—;     -   (ii) R₁ is H or alkyl (e.g., methyl);     -   (iii) R₂ is H, alkyl (e.g., isobutyl, 2-methylbutyl,         2,2-dimethyl propyl), cycloalkyl (e.g., cyclopentyl,         cyclohexyl), haloalkyl (e.g., trifluoromethyl,         2,2,2-trifluoroethyl), alkylaminoalkyl (e.g.,         2-(dimethylamino)ethyl), hydroxyalkyl (e.g., 3-hydroxy-2-methyl         propyl), arylalkyl (e.g., benzyl), heteroarylalkyl (e.g.,         pyridylmethyl), or alkoxyarylalkyl (e.g., 4-methoxybenzyl);     -   (iv) R₃ is a substituted heteroarylaklyl, e.g., substituted with         haloalkyl or     -   R₃ is attached to the nitrogen on the pyrrolo portion of Formula         1 and is a moiety of Formula A

wherein X, Y and Z are, independently, N or C, and R₈, R₉, R₁₁ and R₁₂ are independently H or halogen (e.g., Cl or F); and R₁₀ is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl), diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g., 5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g., pyrazol-1-yl), alkyl sulfonyl (e.g., methyl sulfonyl), arylcarbonyl (e.g., benzoyl), or heteroarylcarbonyl, alkoxycarbonyl, (e.g., methoxycarbonyl), aminocarbonyl; preferably phenyl or pyridyl, e.g., 2-pyridyl; provided that when X, Y or X is nitrogen, R₈, R₉ or R₁₀, respectively, is not present;

-   -   (v) R₄ is aryl (e.g., phenyl);     -   (vi) R₅ is H, alkyl, cycloalkyl (e.g., cyclopentyl), heteroaryl,         aryl, p-benzylaryl (e.g., biphenyl-4-ylmethyl);     -   (vii) R₆ is H, C₁₋₆alkyl (e.g., methyl) or C₃₋₈cycloalkyl;     -   (viii) R₁₃ is —NR₁₄)(R₁₅), C₁₋₆alkyl (e.g., methyl), —OC₁₋₆alkyl         (e.g., —OCH₃), haloC₁₋₆alkyl (trifluoromethyl), aryl (e.g.,         phenyl), or heteroaryl; and     -   (ix) R₁₄ and R₁₅ are independently H or C₁₋₆alkyl,         in free or salt form (hereinafter, Compound of Formula I(i)).

In still another embodiment, the Compound of the Invention is a Compound of Formula I wherein

-   -   (i) Q is —C(═S)—, —C(═O)—;     -   (ii) R₁ is H or alkyl (e.g., methyl);     -   (iii) R₂ is H, alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,         2,2-dimethyl propyl), cycloalkyl (e.g., cyclopentyl,         cyclohexyl), haloalkyl (e.g., trifluoromethyl,         2,2,2-trifluoroethyl), alkylaminoalkyl (e.g.,         2-(dimethylamino)ethyl), hydroxyalkyl (e.g., 3-hydroxy-2-methyl         propyl), arylalkyl (e.g., benzyl), heteroarylalkyl (e.g.,         pyridylmethyl), or alkoxyarylalkyl (e.g., 4-methoxybenzyl);     -   (iv) R₃ is D-E-F wherein         -   1. D is single bond, alkylene (e.g., methylene), or             arylalkylene (e.g., benzylene or —CH₂C₆H₄—);         -   2. E is a alkylene (e.g., methylene, ethynylene,             prop-2-yn-1-ylene), arylene (e.g., phenylene or —C₆H₄—),             alkylarylene (e.g., -benzylene- or —CH₂C₆H₄—), aminoalkylene             (e.g., —CH₂N(H)—) or amino (e.g., —N(H)—); and         -   3. F is alkyl (e.g., isobutyl), aryl (e.g., phenyl),             heteroaryl (e.g., pyrid-2-yl, 1,2,4-triazolyl),             heteroC₃₋₈cycloalkyl (e.g., pyrolidin-1-yl), amino (e.g.,             —NH₂), C₁₋₆alkoxy, or —O-haloalkyl (e.g., —O—CF₃);     -   (v) R₄ is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl,         pyrid-2-yl or pyrazol-3-yl) or heterocycloalkyl (e.g.,         pyrrolidin-3-yl); and     -   (vi) R₅ is H, alkyl, cycloalkyl (e.g., cyclopentyl), heteroaryl,         aryl, p-benzylaryl (e.g., biphenyl-4-ylmethyl);     -   (vii) R₆ is H, C₁₋₆alkyl (e.g., methyl) or C₃₋₈cycloalkyl;     -   (viii) R₁₃ is —N(R₁₄)(R₁₅), C₁₋₆alkyl (e.g., methyl),         —OC₁₋₆alkyl (e.g., —OCH₃), haloC₁₋₆alkyl (trifluoromethyl), aryl         (e.g., phenyl), or heteroaryl; and     -   (x) R₁₄ and R₁₅ are independently H or alkyl,         wherein “alk”, “alkyl”, “haloalkyl” or “alkoxy” refers to C₁₋₆         alkyl and “cycloalkyl” refers to C₃₋₈ cycloalkyl unless         specifically specified;         in free or salt form (hereinafter, Compound of Formula I(ii)).

In still another embodiment, the invention provides a compound of Formula II-A or II-B as follows:

-   -   2.1 Formula II-A or II-B, wherein Q is —C(═S)—, —C(═O)—,         —C(═N(R₇))— or —C(R₁₄)(R₁₅);     -   2.2 Formula II-A or II-B, wherein Q is —C(═S)—;     -   2.3 Formula II-A or II-B, wherein Q is —C(═O);     -   2.4 Formula II-A or II-B, wherein Q is —C(═N(R₇))— or         —C(R₁₄)(R₁₅)—;     -   2.5 Formula II-A or II-B, or any of 2.1-2.4, wherein R₁ is H or         C₁₋₆alkyl (e.g., methyl or ethyl);     -   2.6 Formula II-A or II-B, or any of 2.1-2.4, wherein R₁ is         C₁₋₆alkyl (e.g., methyl or ethyl);     -   2.7 Formula II-A or II-B, or any of 2.1-2.6, wherein R₂ is         -   H,         -   C₁₋₆alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,             2,2-dimethylpropyl) wherein said alkyl group is optionally             substituted with halo (e.g., fluoro) or hydroxy (e.g.,             1-hydroxypropan-2-yl, 3-hydroxy-2-methylpropyl), for             example, R₂ may be a trifluoromethyl or             2,2,2-trifluoroethyl,         -   N(R₁₄)(R₁₅)—C₁₋₆alkyl (e.g., 2-(dimethylamino)ethyl or             2-aminopropyl),         -   arylC₀₋₆alkyl (e.g., phenyl or benzyl),         -   heteroarylC₀₋₆alkyl (e.g., pyridinylmethyl),         -   C₁₋₆alkoxyarylC₁₋₆alkyl (e.g., 4-methoxybenzyl);         -   -G-J wherein:             -   G is a single bond or, alkylene (e.g., methylene);             -   J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl,                 pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted                 with one or more C₁₋₆alkyl (e.g.,                 (1-methylpyrolidin-2-yl)), amino (e.g.,             -   for example, -G-J may be —C₀₋₄alkyl-C₃₋₈cycloalkyl                 (e.g., cyclopentyl, cyclohexyl or cyclopropylmethyl)                 optionally substituted with one or more C₁₋₆alkyl, amino                 (e.g., —NH₂), for example, 2-aminocyclopentyl or                 2-aminocyclohexyl, wherein said cycloalkyl optionally                 contains one or more heteroatom selected from N and O                 (e.g., pyrrolidinyl, for example, pyrrolidin-3-yl or                 pyrrolidin-2-yl, 1-methyl-pyrrolindin-2-yl,                 1-methyl-pyrrolindin-3-yl,                 1-methyl-pyrrolindin-2-yl-methyl or                 1-methyl-pyrrolindin-3-yl-methyl);     -   2.8 Formula II-A or II-B, or any of 2.1-2.7, wherein R₂ is         C₁₋₆alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,         2,2-dimethylpropyl) wherein said alkyl group is optionally         substituted with halo (e.g., fluoro) or hydroxy (e.g.,         1-hydroxypropan-2-yl, 3-hydroxy-2-methylpropyl), for example, R₂         may be a trifluoromethyl or 2,2,2-trifluoroethyl;     -   2.9 Formula II-A or II-B, or any of 2.1-2.7, wherein R₂ is         C₁₋₆alkyl (isopropyl, isobutyl, 2-methylbutyl,         2,2-dimethylpropyl;     -   2.10 Formula II-A or II-B, or any of 2.1-2.9, wherein R₃ is         -   1) -D-E-F wherein:             -   D is a single bond, C₁₋₆alkylene (e.g., methylene), or                 arylalkylene (e.g., p-benzylene or —CH₂C₆H₄—);             -   E is                 -   a single bond,                 -   C₁₋₄alkylene (e.g., methylene)                 -   C₂₋₆alkynylene (e.g., ethynylene,                     prop-2-yn-1-ylene), ethynylene, prop-2-yn-1-ylene),                 -   —C₀₋₄alkylarylene (e.g., phenylene or —C₆H₄—,                     -benzylene- or —CH₂C₆H₄—), wherein the arylene group                     is optionally substituted with halo (e.g., Cl or F),                 -   heteroarylene (e.g., pyridinylene or                     pyrimidinylene),                 -   aminoC₁₋₆alkylene (e.g., —CH₂N(H)—),                 -   amino (e.g., —N(H)—);                 -   C₃₋₈cycloalkylene optionally containing one or more                     heteroatom selected from N or O (e.g.,                     piperidinylene),             -   F is                 -   H,                 -   halo (e.g., F, Br, Cl),                 -   C₁₋₆alkyl (e.g., isopropyl or isobutyl),                 -   haloC₁₋₆alkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl),                 -   C₃₋₈cycloalkyl optionally containing at least one                     atom selected from a group consisting of N or O                     (e.g., cyclopentyl, cyclohexyl, piperidinyl,                     pyrrolidinyl, tetrahydro-2H-pyran-4-yl, or                     morpholinyl), said cycloalkyl is optionally                     substituted with C₁₋₆alkyl (e.g., methyl or                     isopropyl), for example, 1-methylpyrrolidin-2-yl,                     pyrrolidin-1-yl, pyrrolidin-2-yl, piperidin-2-yl,                     1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl,                 -   heteroaryl optionally substituted with C₁₋₆alkyl,                     (e.g., pyridyl, (for example, pyrid-2-yl),                     pyrimidinyl (for example, pyrimidin-2-yl),                     thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl),                     diazolyl (e.g., pyrazolyl (for example,                     pyrazol-1-yl) or imidazolyl (for example,                     imidazol-1-yl, 4-methylimidazolyl,                     1-methylimidazol-2-yl,), triazolyl (e.g.,                     1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), alkoxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                     pyrazol-1-yl), wherein said heteroaryl is optionally                     substituted with halo (e.g., fluoro) or                     haloC₁₋₆alkyl, for example, 6-fluoropyrid-2-yl;                 -   amino (e.g., —NH₂),                 -   C₁₋₆alkoxy,                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),                 -   C₁₋₆alkylsulfonyl (for example, methylsulfonyl or                     —S(O)₂CH₃),                 -   —C(O)—R₁₃,                 -   —N(R₁₄)(R₁₅); or         -   2) a substituted heteroarylaklyl, e.g., substituted with             haloalkyl; or         -   3) attached to the nitrogen on the pyrrolo portion of             Formula I and is a moiety of Formula A

-   -   -   -   wherein X, Y and Z are, independently, N or C, and R₈,                 R₉, R₁₁ and R₁₂ are independently H or halogen (e.g., Cl                 or F); and R₁₀ is                 -   halogen,                 -   C₁₋₆alkyl,                 -   C₁₋₆alkoxy (e.g., methoxy),                 -   C₃₋₈cycloalkyl,                 -   heteroC₃₋₈cycloalkyl (e.g., pyrrolidinyl or                     piperidinyl),                 -   haloC₁₋₆alkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl),                 -   heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl)                     or e.g., thiadiazolyl (for example,                     1,2,3-thiadiazol-4-yl), diazolyl, triazolyl (e.g.,                     1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), alkoxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                     pyrazol-1-yl),                 -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   alkoxycarbonyl, (e.g., methoxycarbonyl),                 -   aminocarbonyl;                 -   wherein the aryl, heteroaryl, cycloalkyl or                     heterocycloalkyl is optionally substituted with one                     or more C₁₋₆alkyl (e.g., methyl), halogen (e.g.,                     chloro or fluoro), haloC₁₋₆alkyl (e.g.,                     trifluoromethyl), hydroxy, carboxy, —SH, or an                     additional aryl or heteroaryl (e.g., biphenyl or                     pyridylphenyl)                 -   preferably R₁₀ is phenyl or pyridyl, e.g., 2-pyridyl                     optionally substituted with the substituents                     previously defined;                 -   provided that when X, Y or X is nitrogen, R₈, R₉ or                     R₁₀, respectively, is not present;

    -   2.11 Formula II-A or II-B, or any of 2.1-2.9, wherein R₃ is         attached to the nitrogen on the pyrrolo portion of Formula I and         is a moiety of Formula A

-   -   -   wherein X, Y and Z are, independently, N or C, and R₈, R₉,             R₁₁ and R₁₂ are independently H or halogen (e.g., Cl or F);             and R₁₀ is             -   halogen,             -   C₁₋₆alkyl,             -   C₁₋₆alkoxy (e.g., methoxy),             -   C₃₋₈cycloalkyl,             -   heteroC₃₋₈cycloalkyl (e.g., pyrrolidinyl or                 piperidinyl),             -   haloC₁₋₆alkyl (e.g., trifluoromethyl),             -   aryl (e.g., phenyl),             -   heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or                 e.g., thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl),                 diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl),                 tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g.,                 5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                 pyrazol-1-yl),             -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),             -   arylcarbonyl (e.g., benzoyl),             -   heteroarylcarbonyl,             -   alkoxycarbonyl, (e.g., methoxycarbonyl),             -   aminocarbonyl;             -   wherein the aryl, heteroaryl, cycloalkyl or                 heterocycloalkyl is optionally substituted with one or                 more C₁₋₆alkyl (e.g., methyl), halogen (e.g., chloro or                 fluoro), haloC₁₋₆alkyl (e.g., trifluoromethyl), hydroxy,                 carboxy, —SH, or an additional aryl or heteroaryl (e.g.,                 biphenyl or pyridylphenyl)             -   preferably R₁₀ is phenyl or pyridyl, e.g., 2-pyridyl                 optionally substituted with the substituents previously                 defined;             -   provided that when X, Y or X is nitrogen, R₈, R₉ or R₁₀,                 respectively, is not present;

    -   2.12 Formula II-A or II-B, or any of 2.1-2.9, wherein R₃ is         attached to the nitrogen on the pyrrolo portion of Formula I and         is a moiety of Formula A

-   -   -   wherein X, Y and Z are, independently, N or C, and R₈, R₉,             R₁₁ and R₁₂ are independently H or halogen (e.g., Cl or F);             and R₁₀ is             -   C₁₋₆alkoxy (e.g., methoxy),             -   C₃₋₈cycloalkyl,             -   heteroC₃₋₈cycloalkyl (e.g., pyrrolidinyl or piperidinyl)             -   haloC₁₋₆alkyl (e.g., trifluoromethyl),             -   aryl (e.g., phenyl),             -   heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or                 e.g., thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl),                 diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl),                 tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g.,                 5-methyl-1,2,4-oxadiazol), pyrazolyl (e.g.,                 pyrazol-1-yl),             -   wherein the aryl, heteroaryl, cycloalkyl or                 heterocycloalkyl is optionally substituted with one or                 more C₁₋₆alkyl (e.g., methyl), halogen (e.g., chloro or                 fluoro), haloC₁₋₆alkyl (e.g., trifluoromethyl), hydroxy,                 carboxy, —SH, or an additional aryl or heteroaryl (e.g.,                 biphenyl or pyridylphenyl)             -   preferably R₁₀ is phenyl, pyridyl, piperidinyl or                 pyrrolidinyl optionally substituted with the                 substituents previously defined, e.g. optionally                 substituted with halo or alkyl;             -   provided that when X, Y or X is nitrogen, R₈, R₉ or R₁₀,                 respectively, is not present;

    -   2.13 Formula II-A or II-B, or any of 2.1-2.12, wherein R₄ and R₅         are independently         -   H,         -   C₁₋₆alkyl (e.g., methyl, isopropyl),         -   C₃₋₈cycloalkyl (e.g., cyclopentyl),         -   C₃₋₈heterocycloalkyl (e.g., pyrrolidin-3-yl),         -   aryl (e.g., phenyl) or         -   heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl)         -   wherein said aryl or heteroaryl is optionally substituted             with halo (e.g., 4-fluorophenyl), hydroxy (e.g.,             4-hydroxyphenyl), C₁₋₆alkyl, C₁₋₆alkoxy or another aryl             group (e.g., biphenyl-4-ylmethyl);

    -   2.14 Formula II-A or II-B, or any of 2.1-2.13, wherein R₄ is H         and R₅ is aryl (e.g., phenyl) optionally substituted with halo         (e.g., 4-fluorophenyl), hydroxy (e.g., 4-hydroxyphenyl),         C₁₋₆alkyl, C₁₋₆alkoxy or another aryl group (e.g.,         biphenyl-4-ylmethyl);

    -   2.15 Formula II-A or II-B, or any of 2.1-2.14, wherein R₆ is H,         C₁₋₆alkyl (e.g., methyl), hydroxy, C₁₋₆alkoxy, aryloxy,         —N(R₁₆)(R₁₇), oxo (e.g., ═O), or C₃₋₈cycloalkyl;

    -   2.16 Formula II-A or II-B, or any of 2.1-2.14, wherein R₆ is         —N(R₁₆)(R₁₇);

    -   2.17 Formula II-A or II-B, or any of 2.1-2.16, wherein R₇ is H,         C₁₋₆alkyl (e.g., methyl) or C₃₋₈cycloalkyl wherein said         cycloalkyl is optionally substituted with one or more oxo (e.g.,         2,5-dioxopyrrolidin-1-yl);

    -   2.18 Formula II-A or II-B, or any of 2.1-2.16, wherein R₇ is H         or C₁₋₆alkyl (e.g., methyl);

    -   2.19 Formula II-A or II-B, or any of 2.1-2.18, wherein R₁₄ and         R₁₅ are independently H or C₁₋₆alkyl;

    -   2.20 Formula II-A or II-B, or any of 2.1-2.19, wherein R₁₆ and         R₁₇ are independently H, C₁₋₆alkyl, aryl (e.g., phenyl),         heteroaryl, wherein said aryl or heteroaryl is optionally         substituted with halo (e.g., fluoro), C₁₋₆alkoxy (e.g.,         methoxy);

    -   2.21 Formula II-A or II-B, or any of 2.1-2.19, wherein R₁₆ is H         and R₁₇ is aryl (phenyl) wherein said aryl or heteroaryl is         optionally substituted with halo (e.g., fluoro), C₁₋₆alkoxy         (e.g., methoxy),

    -   2.22 any of the preceding formulae wherein the compound is         selected from any of the following:

-   -   2.23 any of the preceding formulae wherein the compound is         selected from any of the following:

-   -   2.24 any of the preceding formulae wherein the compounds inhibit         phosphodiesterase-mediated (e.g., PDE1-mediated, especially         PDE1A-mediated or PDE1B-mediated) hydrolysis of cGMP, e.g., with         an IC₅₀ of less than 10 μM, preferably less than 25 μM,         preferably less than 1 μM, more preferably less than 500 nM,         preferably less than 200 nM in an immobilized-metal affinity         particle reagent PDE assay, for example, as described in Example         23,         in free or salt form.

In another embodiment, the invention provides an (optionally 1-, 3-, 5-, 6- and/or 7-substituted)-pyrrolo[3,4-d]pyrimidine-(2,4-dione or 4-thioxo-2-one), in free or salt form.

In still another embodiment, the Compounds of the Invention is a Compound of Formula P-A or P-B:

wherein

-   -   (i) X═O or S     -   (ii) R₁ is H or C₁₋₆alkyl (e.g., methyl or ethyl);     -   (iii) R₂ is         -   H,         -   C₁₋₆alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,             2,2-dimethyl propyl),         -   —C₀₋₆alkyl-C₃₋₉cycloalkyl (e.g., cyclopentyl, cyclohexyl or             cyclopropylmethyl) wherein said cycloalkyl is optionally             substituted with one or more groups selected from C₁₋₄alkyl             and amino (e.g., —NH₂), for example, 2-aminocyclopentyl or             2-aminocyclohexyl),         -   —C₀₋₆alkyl-heteroC₃₋₉cycloalkyl (e.g., pyrrolidinyl, for             example, pyrrolidin-3-yl or pyrrolyin-2-yl; oxetan-2-yl;             tetrahydrofuran-2-yl or tetrahydrofuran-2-ylmethyl) wherein             said heterocycloalkyl is optionally substituted with one ore             more C₁₋₆alkyl (e.g., methyl), for example,             1-methylpyrrolidin-2-yl or 1-methylpyrrolidin-3-yl,         -   haloC₁₋₆alkyl (e.g., trifluoromethyl, 2,2,2-trifluoroethyl),         -   C₀₋₆alkylaminoC₀₋₆alkyl (e.g., 2-(dimethylamino)ethyl,             2-aminopropyl),         -   hydroxyC₁₋₆alkyl (e.g., 3-hydroxy-2-methylpropyl or             2-hydroxy-1-methylethyl),         -   arylC₀₋₆alkyl (e.g., phenyl or benzyl) wherein said aryl             group is optionally substituted with one or more C₁₋₆alkoxy,             for example, 4-methoxybenzyl,         -   heteroarylC₁₋₆alkyl (e.g., pyridylmethyl),     -   (iv) R₃ is         -   a) hydrogen,         -   b) -D-E-F wherein             -   D is single bond, C₁₋₆alkylene (e.g., methylene,                 ethynylene, prop-2-yn-1-ylene), or arylC₁₋₆alkylene                 (e.g., benzylene or —CH₂C₆H₄—);             -   E is                 -   arylene (e.g., phenylene or —C₆H₄—), wherein the                     arylene is optionally substituted with one or more                     halo,                 -   arylC₁₋₆alkylene (e.g., -benzylene- or —CH₂C₆H₄—),                 -   aminoC₁₋₆alkylene (e.g., —CH₂N(H)—),                 -   amino (e.g., —N(H)—),                 -   heteroarylene (e.g., pyrid-3-ylene) or                     heteroC₃₋₉cycloakylene (e.g., piperidin-4-ylene)                     wherein the heteroarylene and the                     heterocycloalkylene are independently and optionally                     substituted with one or more halo; and             -   F is                 -   Hydrogen,                 -   C₁₋₆alkyl (e.g., isobutyl, isopropyl),                 -   aryl (e.g., phenyl) wherein said aryl is optionally                 -   substituted with one or more halo and/or                     haloC₁₋₆alkyl,                 -   heteroaryl (e.g., triazolyl, diazolyl, oxadiazolyl,                     pyridyl, pyrimidinyl) wherein said heteroaryl is                     optionally substituted with one or more groups                     selected from halo (e.g., fluoro), C₁₋₆alkyl and                     haloC₁₋₆alkyl (e.g., trifluoromethyl), for example,                     pyrid-2-yl, 4,6-dimethyl-pyrid-2-yl,                     5-fluoropyrimidin-2-yl, imidazol-1-yl,                     4-methylimidazolyl, 1-methylimidazol-2-yl,                     pyrazol-1-yl, 1,2,4-triazol-1-yl,                     5-methyl-1,2,4-oxadiazol-3-yl or pyrimidin-2-yl,                 -   heteroC₃₋₉cycloalkyl (e.g., piperidinyl,                     pyrrolidinyl) wherein said heterocycloalkyl is                     optionally substituted with one or more C₁₋₆alkyl                     (e.g., methyl), for example, pyrrolidin-1-yl,                     pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl,                     piperidin-2-yl, 1-methylpiperidin-2-yl,                     1-ethylpiperidin-2-yl,                 -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are                     independently H or C₁₋₆alkyl (e.g., dimethylamino or                     isopropylamino),                 -   aminocarbonyl (e.g., —C(O)NH₂),                 -   C₁₋₆alkoxy,                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   C₁₋₆alkoxycarbonyl (e.g., methoxycarbonyl),                 -   C₁₋₆alkyl sulfonyl (e.g., —S(O)₂—CH₃),                 -   halo (e.g., chloro or fluoro),                 -   haloC₁₋₆alkyl (e.g., —CF₃), or                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),         -   c) R₃ is heteroarylC₀₋₆alkyl, wherein the heteroaryl group             is optionally substituted with one or more C₁₋₆haloalkyl; or         -   d) R₃ is a moiety of Formula A

-   -   -   -   wherein X, Y and Z are, independently, N or C, and R₈,                 R₉, R₁₁ and R₁₂ are independently H or halogen (e.g., Cl                 or F); and             -   R₁₀ is                 -   hydrogen,                 -   halogen (e.g., fluoro or chloro),                 -   C₁₋₆alkyl,                 -   C₃₋₉cycloalkyl,                 -   C₁₋₆haloalkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl) wherein said aryl is optionally                     substituted with one or more halo and/or                     haloC₁₋₆alkyl,                 -   heteroaryl wherein said heteroaryl group is                     optionally substituted with one or more groups                     selected from halo (e.g., fluoro), C₁₋₆alkyl and                     haloC₁₋₆alkyl, e.g., pyridyl, (for example,                     pyrid-2-yl, 6-fluoro-pyrid-2-yl,                     5-trifluoromethyl-pyrid-2-yl,                     6-trifluoromethyl-pyrid-3-yl,                     4,6-dimethylpyrid-2-yl), thiadiazolyl (for example,                     1,2,3-thiadiazol-4-yl), diazolyl (for example,                     pyrazolyl, e.g., pyrazol-1-yl), triazolyl (for                     example, 1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), oxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol-3-yl),                 -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   C₁₋₆alkoxycarbonyl, (e.g., methoxycarbonyl),                 -   aminocarbonyl (i.e., —C(O)NH₂),                 -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are                     independently H or C₁₋₆alkyl (e.g., —NH₂,                     dimethylamino or isopropylamino),                 -   haloC₁₋₆alkyl,                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),                 -   heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl,                     pyrrolidinyl, pyrrolidinylmethyl) wherein said                     heterocycloalkyl is optionally substituted with one                     or more C₁₋₆alkyl (e.g., methyl), for example,                     pyrrolidin-1-yl, pyrrolidin-2-yl,                     1-methylpyrrolidin-2-yl, piperidin-2-yl,                     1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;                 -   provided that when X, Y or Z is nitrogen, R₈, R₉ or                     R₁₀,                 -   respectively, is not present;

    -   (v) R₄ and R₅ are independently selected from         -   H,         -   C₁₋₆alkyl (e.g., methyl or isopropyl),         -   C₃₋₉cycloalkyl (e.g., cyclopentyl),         -   C₃₋₉heterocycloalkyl (e.g., pyrrolidin-3-yl),         -   heteroaryl (e.g., pyrid-2-yl, pyrid-3-yl or pyrid-4-yl,             pyrazol-3-yl), aryl (e.g., phenyl) or arylC₁₋₆alkyl (e.g.,             benzyl), wherein the aryl group is optionally substituted             with one or more halo (e.g., F or Cl), hydroxy and/or             another aryl, (e.g., p-benzylaryl, e.g.,             biphenyl-4-ylmethyl);

    -   (vi) R₆ is H or C₁₋₆alkyl (e.g., ethyl);         in free or salt form.

The invention further provides compounds of Formula P-A or P-B as follows:

-   -   3.1. Formula P-A or P-B wherein, R₁ is H or C₁₋₆alkyl (e.g.,         methyl or ethyl);     -   3.2. Formula P-A or P-B wherein, R₁ is H;     -   3.3. Formula P-A or P-B wherein, R₁ is C₁₋₆alkyl (e.g., methyl         or ethyl);     -   3.4. Formula P-A or P-B wherein, R₁ is methyl;     -   3.5. Formula P-A or P-B or any of 1.1-3.4 wherein, R₂ is         -   H,         -   C₁₋₆alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl,             2,2-dimethyl propyl),         -   —C₀₋₆alkyl-C₃₋₉cycloalkyl (e.g., cyclopentyl, cyclohexyl or             cyclopropylmethyl) wherein said cycloalkyl is optionally             substituted with one or more groups selected from C₁₋₄alkyl             and amino (e.g., —NH₂), for example, 2-aminocyclopentyl or             2-aminocyclohexyl),         -   —C₀₋₆alkyl-heteroC₃₋₉cycloalkyl (e.g., pyrrolidinyl, for             example, pyrrolidin-3-yl or pyrrolyin-2-yl; oxetan-2-yl;             tetrahydrofuran-2-yl or tetrahydrofuran-2-ylmethyl) wherein             said heterocycloalkyl is optionally substituted with one ore             more C₁₋₆alkyl (e.g., methyl), for example,             1-methylpyrrolidin-2-yl or 1-methylpyrrolidin-3-yl,         -   haloC₁₋₆alkyl (e.g., trifluoromethyl, 2,2,2-trifluoroethyl),         -   C₀₋₆alkylamino, C₀₋₆alkyl (e.g., 2-(dimethylamino)ethyl,             2-aminopropyl),         -   hydroxyC₁₋₆alkyl (e.g., 3-hydroxy-2-methylpropyl or             2-hydroxy-1-methylethyl),         -   arylC₀₋₆alkyl (e.g., phenyl or benzyl) wherein said aryl             group is optionally substituted with one or more C₁₋₆alkoxy,             for example, 4-methoxybenzyl, heteroarylC₁₋₆alkyl (e.g.,             pyridylmethyl);     -   3.6. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is H;     -   3.7. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         C₁₋₆alkyl;     -   3.8. Formula 3.7 wherein, R₂ is isopropyl, isobutyl,         2,2-dimethylpropyl, or 2-methylbutyl;     -   3.9. Formula 3.7 wherein, R₂ is isobutyl;     -   3.10. Formula 3.7 wherein, R₂ is 2,2-dimethylpropyl;     -   3.11. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         hydroxyC₁₋₆alkyl;     -   3.12. Formula 3.11, wherein R₂ is 2-hydroxy-1-methylethyl;     -   3.13. Formula P-A or P-B or 1.1-3.5 wherein R₂ is         —C₀₋₆alkyl-C₃₋₉cycloalkyl (e.g., cyclopentyl, cyclohexyl or         cyclopropylmethyl) wherein said cycloalkyl is optionally         substituted with one or more groups selected from C₁₋₄alkyl and         amino (e.g., —NH₂), for example, 2-aminocyclopentyl or         2-aminocyclohexyl);     -   3.14. Formula 3.13 wherein R₂ is C₃₋₉cycloalkyl-C₁₋₆alkyl;     -   3.15. Formula 3.13 wherein R₂ is cyclopentyl, cyclohexyl or         cyclopropylmethyl;     -   3.16. Formula 3.13 wherein R₂ is cyclopropylmethyl;     -   3.17. Formula 3.13 wherein R₂ is 2-aminocyclopentyl;     -   3.18. Formula 3.13 wherein R₂ is 2-aminocyclohexyl;     -   3.19. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         haloC₁₋₆alkyl (e.g., trifluoromethyl, 2,2,2-trifluoroethyl);     -   3.20. Formula 3.19, wherein R₂ is 2,2,2-trifluoroethyl;     -   3.21. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         —C₀₋₆alkyl-heteroC₃₋₉cycloalkyl (e.g., pyrrolidinyl, for         example, pyrrolidin-3-yl or pyrrolyin-2-yl; oxetan-2-yl;         tetrahydrofuran-2-yl or tetrahydrofuran-2-ylmethyl) wherein said         heterocycloalkyl is optionally substituted with one ore more         C₁₋₆alkyl (e.g., methyl), for example, 1-methylpyrrolidin-2-yl         or 1-methylpyrrolidin-3-yl;     -   3.22. Formula 3.21, wherein R₂ is pyrrolidinyl (e.g.,         pyrrolidin-3-yl);     -   3.23. Formula 3.21, wherein R₂ is 1-methylpyrrolidin-3-yl;     -   3.24. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         C₀₋₆alkylaminoC₀₋₆alkyl (e.g., 2-(dimethylamino)ethyl,         2-aminopropyl);     -   3.25. Formula 3.24, wherein R₂ is 2-(dimethylamino)ethyl;     -   3.26. Formula 3.24, wherein R₂ is 2-aminopropyl;     -   3.27. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         arylC₀₋₆alkyl (e.g., phenyl or benzyl) wherein said aryl group         is optionally substituted with one or more C₁₋₆alkoxy, for         example, 4-methoxybenzyl;     -   3.28. Formula 3.27, wherein R₂ is benzyl;     -   3.29. Formula P-A or P-B or any of 1.1-3.5, wherein R₂ is         heteroarylC₁₋₆alkyl (e.g., pyridylmethyl);     -   3.30. Formula 3.29, wherein R₂ is pyridylmethyl;     -   3.31. Any of the preceding formulae wherein R₃ is         -   a) hydrogen,         -   b) -D-E-F wherein             -   D is single bond, C₁₋₆alkylene (e.g., methylene,                 ethynylene, prop-2-yn-1-ylene), or arylC₁₋₆alkylene                 (e.g., benzylene or —CH₂C₆H₄—);             -   E is                 -   arylene (e.g., phenylene or —C₆H₄—), wherein the                     arylene is optionally substituted with one or more                     halo,                 -   arylC₁₋₆alkylene (e.g., -benzylene- or —CH₂C₆H₄—),                 -   aminoC₁₋₆alkylene (e.g., —CH₂N(H)—),                 -   amino (e.g., —N(H)—),                 -   heteroarylene (e.g., pyrid-3-ylene) or                     heteroC₃₋₉cycloakylene (e.g., piperidin-4-ylene)                     wherein the heteroarylene and the                     heterocycloalkylene are independently and optionally                     substituted with one or more halo; and             -   F is                 -   hydrogen,                 -   C₁₋₆alkyl (e.g., isobutyl, isopropyl),                 -   aryl (e.g., phenyl) wherein said aryl is optionally                     substituted with one or more halo and/or                     haloC₁₋₆alkyl,                 -   heteroaryl (e.g., triazolyl, diazolyl, oxadiazolyl,                     pyridyl, pyrimidinyl) wherein said heteroaryl is                     optionally substituted with one or more groups                     selected from halo (e.g., fluoro), C₁₋₆alkyl and                     haloC₁₋₆alkyl (e.g., trifluoromethyl), for example,                     pyrid-2-yl, 4,6-dimethyl-pyrid-2-yl,                     5-fluoropyrimidin-2-yl, imidazol-1-yl,                     4-methylimidazolyl, 1-methylimidazol-2-yl,                     pyrazol-1-yl, 1,2,4-triazol-1-yl,                     5-methyl-1,2,4-oxadiazol-3-yl or pyrimidin-2-yl,                 -   heteroC₃₋₉cycloalkyl (e.g., piperidinyl,                     pyrrolidinyl) wherein said heterocycloalkyl is                     optionally substituted with one or more C₁₋₆alkyl                     (e.g., methyl), for example, pyrrolidin-1-yl,                     pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl,                     piperidin-2-yl, 1-methylpiperidin-2-yl,                     1-ethylpiperidin-2-yl,                 -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are                     independently H or C₁₋₆alkyl (e.g., dimethylamino or                     isopropylamino),                 -   aminocarbonyl (e.g., —C(O)NH₂),                 -   C₁₋₆alkoxy,                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   C₁₋₆alkoxycarbonyl (e.g., methoxycarbonyl),                 -   C₁₋₆alkyl sulfonyl (e.g., —S(O)₂—CH₃),                 -   halo (e.g., chloro or fluoro),                 -   haloC₁₋₆alkyl (e.g., —CF₃), or                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),         -   c) R₃ is heteroarylC₀₋₆alkyl wherein the heteroaryl group is             optionally substituted with one or more C₁₋₆haloalkyl; or         -   d) R₃ is a moiety of Formula A

-   -   -   -   wherein X, Y and Z are, independently, N or C, and R₈,                 R₉, R₁₁ and R₁₂ are independently H or halogen (e.g., Cl                 or F); and             -   R₁₀ is                 -   hydrogen,                 -   halogen (e.g., fluoro or chloro),                 -   C₁₋₆alkyl,                 -   C₃₋₉cycloalkyl,                 -   C₁₋₆haloalkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl) wherein said aryl is optionally                     substituted with one or more halo and/or                     haloC₁₋₆alkyl,                 -   heteroaryl wherein said heteroaryl group is                     optionally substituted with one or more groups                     selected from halo (e.g., fluoro), C₁₋₆alkyl and                     haloC₁₋₆alkyl, e.g., pyridyl, (for example,                     pyrid-2-yl, 6-fluoro-pyrid-2-yl,                     5-trifluoromethyl-pyrid-2-yl,                     6-trifluoromethyl-pyrid-3-yl,                     4,6-dimethylpyrid-2-yl), thiadiazolyl (for example,                     1,2,3-thiadiazol-4-yl), diazolyl (for example,                     pyrazolyl, e.g., pyrazol-1-yl), triazolyl (for                     example, 1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), oxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol-3-yl),                 -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   C₁₋₆alkoxycarbonyl, (e.g., methoxycarbonyl),                 -   aminocarbonyl (i.e., —C(O)NH₂),                 -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are                     independently H or C₁₋₆alkyl (e.g., —NH₂,                     dimethylamino or isopropylamino),                 -   haloC₁₋₆alkyl,                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),                 -   heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl,                     pyrrolidinyl, pyrrolidinylmethyl) wherein said                     heterocycloalkyl is optionally substituted with one                     or more C₁₋₆alkyl (e.g., methyl), for example,                     pyrrolidin-1-yl, pyrrolidin-2-yl,                     1-methylpyrrolidin-2-yl, piperidin-2-yl,                     1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;                 -   provided that when X, Y or Z is nitrogen, R₈, R₉ or                     R₁₀, respectively, is not present;

    -   3.32. Formula 3.31, wherein R₃ is -D-E-F and D, E and F are         previously defined in Formula P-A or P-B;

    -   3.33. Formula 3.31 or 3.32, wherein D is single bond,         C₁₋₆alkylene (e.g., methylene, ethynylene, prop-2-yn-1-ylene),         or arylC₁₋₆alkylene (e.g., benzylene or —CH₂C₆H₄—);

    -   3.34. Formula 3.31 or 3.32, wherein D is C₁₋₆alkylene (e.g.,         methylene, ethynylene, prop-2-yn-1-ylene);

    -   3.35. Formula 3.31 or 3.32, wherein D is a single bond;

    -   3.36. Formula 3.31 or 3.32, wherein D is arylC₁₋₆alkylene;

    -   3.37. Formula 3.31 or 3.32, wherein D is benzylene;

    -   3.38. Any of formulae P-A or P-B or 3.31-3.37, wherein E is         -   arylene (e.g., phenylene or —C₆H₄—), wherein the arylene is             optionally substituted with one or more halo,         -   arylC₁₋₆alkylene (e.g., -benzylene- or —CH₂C₆H₄—),         -   aminoC₁₋₆alkylene (e.g., —CH₂N(H)—),         -   amino (e.g., —N(H)—),         -   heteroarylene (e.g., pyrid-3-ylene) or             heteroC₃₋₉cycloakylene (e.g., piperidin-4-ylene) wherein the             heteroarylene and the heterocycloalkylene are independently             and optionally substituted with one or more halo;

    -   3.39. any of formulae P-A or P-B or 3.31-3.38, wherein E is         aminoC₁₋₆alkylene (e.g., —CH₂N(H)—);

    -   3.40. any of formulae P-A or P-B or 3.31-3.38, wherein E is         arylene (e.g., phenylene or —C₆H₄—) wherein the arylene is         optionally substituted with one or more halo;

    -   3.41. any of formulae P-A or P-B or 3.31-3.38, wherein E is         heteroC₃₋₉cycloakylene (e.g., piperidin-4-ylene) wherein the         heterocycloalkylene is optionally substituted with one or more         halo;

    -   3.42. any of formulae P-A or P-B or 3.31-3.38, wherein E is         heteroarylene (e.g., pyrid-3-ylene) wherein the heteroarylene is         optionally substituted with one or more halo;

    -   3.43. any of formulae P-A or P-B or 3.31-3.38, wherein E is         arylC₁₋₆alkylene (e.g., benzylene or —C₆H₄—) wherein the         arylalkylene is optionally substituted with one or more halo;

    -   3.44. Any of formulae P-A or P-B or 3.31-3.43, wherein F is         -   Hydrogen,         -   C₁₋₆alkyl (e.g., isobutyl, isopropyl),         -   aryl (e.g., phenyl) wherein said aryl is optionally             substituted with one or more halo and/or haloC₁₋₆alkyl,         -   heteroaryl (e.g., triazolyl, diazolyl, oxadiazolyl, pyridyl,             pyrimidinyl) wherein said heteroaryl is optionally             substituted with one or more groups selected from halo             (e.g., fluoro), C₁₋₆alkyl and haloC₁₋₆alkyl (e.g.,             trifluoromethyl), for example, pyrid-2-yl,             4,6-dimethyl-pyrid-2-yl, 5-fluoropyrimidin-2-yl,             imidazol-1-yl, 4-methylimidazolyl, 1-methylimidazol-2-yl,             pyrazol-1-yl, 1,2,4-triazol-1-yl,             5-methyl-1,2,4-oxadiazol-3-yl or pyrimidin-2-yl,         -   heteroC₃₋₉cycloalkyl (e.g., piperidinyl, pyrrolidinyl)             wherein said heterocycloalkyl is optionally substituted with             one or more C₁₋₆alkyl (e.g., methyl), for example,             pyrrolidin-1-yl, pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl,             piperidin-2-yl, 1-methylpiperidin-2-yl,             1-ethylpiperidin-2-yl,         -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are independently H             or C₁₋₆alkyl (e.g., —NH₂, dimethylamino or isopropylamino),         -   aminocarbonyl (e.g., —C(O)NH₂),         -   C₁₋₆alkoxy,         -   arylcarbonyl (e.g., benzoyl),         -   heteroarylcarbonyl,         -   C₁₋₆alkoxycarbonyl (e.g., methoxycarbonyl),         -   C₁₋₆alkyl sulfonyl (e.g., —S(O)₂—CH₃),         -   halo (e.g., chloro or fluoro),         -   haloC₁₋₆alkyl (e.g., —CF₃), or         -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),

    -   3.45. Formula 3.44, wherein F is aryl (e.g., phenyl) wherein         said aryl is optionally substituted with one or more halo and/or         haloC₁₋₆alkyl;

    -   3.46. Formula 3.44, wherein F is phenyl optionally substituted         with one or more halo and/or haloC₁₋₆alkyl;

    -   3.47. Formula 3.44, wherein F is C₁₋₆alkoxy (e.g., methoxy);

    -   3.48. Formula 3.47, wherein F is methoxy;

    -   3.49. Formula 3.44, wherein F is —O-haloC₁₋₆alkyl (e.g., —OCF₃);

    -   3.50. Formula 3.44 or 3.49, wherein F is —OCF₃;

    -   3.51. Formula 3.44, wherein F is halo (e.g., chloro or fluoro);

    -   3.52. Formula 3.44, wherein F is —N(R_(a))(R_(b)) wherein R_(a)         and R_(b) are independently H or C₁ alkyl (e.g., —NH₂,         dimethylamino or isopropylamino);

    -   3.53. Formula 3.44, wherein F is heteroC₃₋₉cycloalkyl (e.g.,         piperidinyl, pyrrolidinyl) wherein said heterocycloalkyl is         optionally substituted with one or more C₁₋₆alkyl (e.g.,         methyl), for example, pyrrolidin-1-yl, pyrrolidin-2-yl,         1-methylpyrrolidin-2-yl, piperidin-2-yl, 1-methylpiperidin-2-yl,         1-ethylpiperidin-2-yl;

    -   3.54. Formula 3.44 or 3.53 wherein F is pyrrolidin-1-yl;

    -   3.55. Formula 3.44 or 3.53 wherein F is pyrrolidin-2-yl;

    -   3.56. Formula 3.44 or 3.53 wherein F is 1-methylpyrrolidin-2-yl;

    -   3.57. Formula 3.44 or 3.53 wherein F is piperidin-2-yl;

    -   3.58. Formula 3.44 or 3.53 wherein F is 1-methylpiperidin-2-yl;

    -   3.59. Formula 3.44 or 3.53 wherein F is 1-ethylpiperidin-2-yl;

    -   3.60. Formula 3.44, wherein F is C₁₋₆alkyl (e.g., isobutyl,         isopropyl);

    -   3.61. Formula 3.44 or 3.60, wherein F is isobutyl;

    -   3.62. Formula 3.44 or 3.60, wherein F is isopropyl;

    -   3.63. Formula 3.44, wherein F is heteroaryl (e.g., triazolyl,         diazolyl, oxadiazolyl, pyridyl, pyrimidinyl) wherein said         heteroaryl is optionally substituted with one or more groups         selected from halo (e.g., fluoro), C₁₋₆alkyl and haloC₁₋₆alkyl         (e.g., trifluoromethyl), for example, pyrid-2-yl,         4,6-dimethyl-pyrid-2-yl, 5-fluoropyrimidin-2-yl, imidazol-1-yl,         4-methylimidazolyl, 1-methylimidazol-2-yl, pyrazol-1-yl,         1,2,4-triazol-1-yl, 5-methyl-1,2,4-oxadiazol-3-yl or         pyrimidin-2-yl;

    -   3.64. Formula 3.44 or 3.63, wherein F is pyridyl (e.g.,         pyrid-2-yl);

    -   3.65. Formula 3.44 or 3.63, wherein F is pyridyl (e.g.,         pyrid-2-yl) optionally substituted with one or more groups         selected from halo (e.g., fluoro), C₁₋₆alkyl and haloC₁₋₆alkyl         (e.g., trifluoromethyl);

    -   3.66. Formula 3.44 or 3.63, wherein F is 6-fluoro-pyrid-2-yl;

    -   3.67. Formula 3.44 or 3.63, wherein F is imidazolyl optionally         substituted with C₁₋₆alkyl;

    -   3.68. Formula 3.44 or 3.63, wherein F is imidazol-1-yl;

    -   3.69. Formula 3.44 or 3.63, wherein F is 4-methylimidazol-1-yl;

    -   3.70. Formula 3.44 or 3.63, wherein F is 1-methylimidazol-2-yl;

    -   3.71. Formula 3.44 or 3.63, wherein F is 1,2,4-triazol-1-yl;

    -   3.72. Formula 3.44, wherein F is aminocarbonyl (e.g., —C(O)NH₂);

    -   3.73. Formula 3.44, wherein F is arylcarbonyl (e.g., benzoyl);

    -   3.74. Formula 3.44, wherein F is heteroarylcarbonyl;

    -   3.75. Formula 3.44, wherein F is C₁₋₆alkoxycarbonyl (e.g.,         methoxycarbonyl);

    -   3.76. Formula 3.44, wherein F is haloC₁₋₆alkyl (e.g., —CF₃);

    -   3.77. Formula 3.44, wherein F is halo (e.g., chloro or fluoro);

    -   3.78. Formula 3.44, wherein F is C₁₋₆alkyl sulfonyl (e.g.,         —S(O)₂—CH₃);

    -   3.79. Any of formulae 3.1-3.31, wherein R₃ is H;

    -   3.80. Any of formulae 3.1-3.31, wherein R₃ is a         heteroarylC₁₋₆alkyl optionally substituted with C₁₋₆haloalkyl;

    -   3.81. Any of formulae 3.1-3.31, wherein R₃ is a moiety of         Formula A as hereinbefore described in Formula P-A or P-B:

-   -   -   wherein X, Y and Z are, independently, N or C, and R₈, R₉,             R₁₁ and R₁₂ are independently H or halogen (e.g., Cl or F);             and             -   R₁₀ is                 -   hydrogen,                 -   halogen (e.g., fluoro or chloro),                 -   C₁₋₆alkyl,                 -   C₃₋₉cycloalkyl,                 -   C₁₋₆haloalkyl (e.g., trifluoromethyl),                 -   aryl (e.g., phenyl) wherein said aryl is optionally                     substituted with one or more halo and/or                     haloC₁₋₆alkyl,                 -   heteroaryl wherein said heteroaryl group is                     optionally substituted with one or more groups                     selected from halo (e.g., fluoro), C₁₋₆alkyl and                     haloC₁₋₆alkyl, e.g., pyridyl, (for example,                     pyrid-2-yl, 6-fluoro-pyrid-2-yl,                     5-trifluoromethyl-pyrid-2-yl,                     6-trifluoromethyl-pyrid-3-yl,                     4,6-dimethylpyrid-2-yl), thiadiazolyl (for example,                     1,2,3-thiadiazol-4-yl), diazolyl (for example,                     pyrazolyl, e.g., pyrazol-1-yl), triazolyl (for                     example, 1,2,4-triazol-1-yl), tetrazolyl (e.g.,                     tetrazol-5-yl), oxadiazolyl (e.g.,                     5-methyl-1,2,4-oxadiazol-3-yl),                 -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),                 -   arylcarbonyl (e.g., benzoyl),                 -   heteroarylcarbonyl,                 -   C₁₋₆alkoxycarbonyl, (e.g., methoxycarbonyl),                 -   aminocarbonyl (i.e., —C(O)NH₂),                 -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are                     independently H or C₁₋₆alkyl (e.g., —NH₂,                     dimethylamino or isopropylamino), haloC₁₋₆alkyl,                 -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),                 -   heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl,                     pyrrolidinyl, pyrrolidinylmethyl) wherein said                     heterocycloalkyl is optionally substituted with                     C₁₋₆alkyl (e.g., methyl), for example,                     pyrrolidin-1-yl, pyrrolidin-2-yl,                     1-methylpyrrolidin-2-yl, piperidin-2-yl,                     1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;                 -   provided that when X, Y or Z is nitrogen, R₃, R₉ or                     R₁₀, respectively, is not present;

    -   3.82. Formula 3.81, wherein the moiety of Formula A is benzyl         (i.e., X, Y and Z are carbon) and R₁₀ is selected from         -   hydrogen,         -   halogen (e.g., fluoro or chloro),         -   C₁₋₆alkyl,         -   C₃₋₉cycloalkyl,         -   C₁₋₆haloalkyl (e.g., trifluoromethyl),         -   aryl (e.g., phenyl) wherein said aryl is optionally             substituted with one or more halo and/or haloC₁₋₆alkyl,         -   heteroaryl wherein said heteroaryl group is optionally             substituted with one or more groups selected from halo             (e.g., fluoro), C₁₋₆alkyl and haloC₁₋₆alkyl, e.g., pyridyl,             (for example, pyrid-2-yl, 6-fluoro-pyrid-2-yl,             5-trifluoromethyl-pyrid-2-yl, 6-trifluoromethyl-pyrid-3-yl,             4,6-dimethylpyrid-2-yl), thiadiazolyl (for example,             1,2,3-thiadiazol-4-yl), diazolyl (for example, pyrazolyl,             e.g., pyrazol-1-yl), triazolyl (for example,             1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl),             oxadiazolyl(e.g., 5-methyl-1,2,4-oxadiazol-3-yl),         -   C₁₋₆alkyl sulfonyl (e.g., methyl sulfonyl),         -   arylcarbonyl (e.g., benzoyl),         -   heteroarylcarbonyl,         -   C₁₋₆alkoxycarbonyl, (e.g., methoxycarbonyl), aminocarbonyl             (i.e., —C(O)NH₂),         -   —N(R_(a))(R_(b)) wherein R_(a) and R_(b) are independently H             or C₁₋₆alkyl (e.g., —NH₂, dimethylamino or isopropylamino),         -   haloC₁₋₆alkyl,         -   —O-haloC₁₋₆alkyl (e.g., —O—CF₃),         -   heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl,             pyrrolidinyl, pyrrolidinylmethyl) wherein said             heterocycloalkyl is optionally substituted with one or more             C₁₋₆alkyl (e.g., methyl), for example, pyrrolidin-1-yl,             pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl, piperidin-2-yl,             1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;         -   provided that when X, Y or Z is nitrogen, R₈, R₉ or R₁₀,             respectively, is not present;

    -   3.83. Formula 3.81 or 3.82, wherein R₁₀ is aryl (e.g., phenyl)         wherein said aryl is optionally substituted with one or more         halo and/or haloC₁₋₆alkyl;

    -   3.84. Formula 3.81 or 3.82, wherein R₁₀ is heteroaryl wherein         said heteroaryl group is optionally substituted with one or more         groups selected from halo (e.g., fluoro), C₁₋₆alkyl and         haloC₁₋₆alkyl, e.g., pyridyl, (for example, pyrid-2-yl,         6-fluoro-pyrid-2-yl, 5-trifluoromethyl-pyrid-2-yl,         6-trifluoromethyl-pyrid-3-yl, 4,6-dimethylpyrid-2-yl),         thiadiazolyl (for example, 1,2,3-thiadiazol-4-yl), diazolyl (for         example, pyrazolyl, e.g., pyrazol-1-yl), triazolyl (for example,         1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl),         oxadiazolyl (e.g., 5-methyl-1,2,4-oxadiazol-3-yl);

    -   3.85. Formula 3.81 or 3.82, wherein R₁₀ is pyrid-2-yl or         pyrid-3-yl optionally substituted with one or more groups         selected from halo (e.g., fluoro), C₁₋₆alkyl and haloC₁₋₆alkyl;

    -   3.86. Formula 3.81 or 3.82, wherein R₁₀ is 6-fluoro-pyrid-2-yl;

    -   3.87. Formula 3.81 or 3.82, wherein R₁₀ is         4,6-dimethylpyrid-2-yl;

    -   3.88. Formula 3.81 or 3.82, wherein R₁₀ is halogen (e.g.,         fluoro);

    -   3.89. Formula 3.81 or 3.82, wherein R₁₀ is hydrogen;

    -   3.90. Formula 3.81 or 3.82, wherein R₁₀ is C₁₋₆alkyl;

    -   3.91. Formula 3.81 or 3.82, wherein R₁₀ is C₃₋₉cycloalkyl;

    -   3.92. Formula 3.81 or 3.82, wherein R₁₀ is C₁₋₆haloalkyl (e.g.,         trifluoromethyl),

    -   3.93. Formula 3.81 or 3.82, wherein R₁₀ is C₁₋₆alkyl sulfonyl         (e.g., methyl sulfonyl;

    -   3.94. Formula 3.81 or 3.82, wherein R₁₀ is         heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl, pyrrolidinyl,         pyrrolidinylmethyl) wherein said heterocycloalkyl is optionally         substituted with one or more C₁₋₆alkyl (e.g., methyl), for         example, pyrrolidin-1-yl, pyrrolidin-2-yl,         1-methylpyrrolidin-2-yl, piperidin-2-yl, 1-methylpiperidin-2-yl,         1-ethylpiperidin-2-yl;

    -   3.95. Formula 3.81 or 3.82, wherein R₁₀ is, pyrrolidin-1-yl or         pyrrolidin-2-yl;

    -   3.96. Formula 3.81 or 3.82, wherein R₁₀ is         1-methylpyrrolidin-2-yl;

    -   3.97. Formula 3.81 or 3.82, wherein R₁₀ is piperidin-2-yl;

    -   3.98. Formula 3.81 or 3.82, wherein R₁₀ is         1-methylpiperidin-2-yl;

    -   3.99. Formula 3.81 or 3.82, wherein R₁₀ is         1-ethylpiperidin-2-yl;

    -   3.100. Formula 3.81 or 3.82, wherein R₁₀ is C₁₋₆alkyl sulfonyl         (e.g., methyl sulfonyl);

    -   3.101. Formula 3.81 or 3.82, wherein R₁₀ is arylcarbonyl (e.g.,         benzoyl);

    -   3.102. Formula 3.81 or 3.82, wherein R₁₀ is heteroarylcarbonyl;

    -   3.103. Formula 3.81 or 3.82, wherein R₁₀ is C₁₋₆alkoxycarbonyl,         (e.g., methoxycarbonyl);

    -   3.104. Formula 3.81 or 3.82, wherein R₁₀ is aminocarbonyl (i.e.,         —C(O)NH₂);

    -   3.105. Formula 3.81 or 3.82, wherein R₁₀ is haloC₁₋₆alkyl;

    -   3.106. Formula 3.81 or 3.82, wherein R₁₀ is —O-haloC₁₋₆alkyl         (e.g., —O—CF₃);

    -   3.107. Formula 3.81 or 3.82, wherein R₁₀ is —N(R_(a))(R_(b))         wherein R_(a) and R_(b) are independently H or C₁₋₆alkyl (e.g.,         —NH₂, dimethylamino or isopropylamino);

    -   3.108. any of formulae 3.81-3.107, wherein R₈, R₉, R₁₁ and R₁₂         are independently H or halogen (e.g., Cl or F);

    -   3.109. formulae 3.81-3.107, wherein R₈, R₉, R₁₁ and R₁₂ are H;

    -   3.110. formulae 3.81-3.107, wherein R₈, R₉, R₁₁ and R₁₂ are         independently halogen (e.g., Cl or F);

    -   3.111. any of formulae 3.81-3.110, wherein X, Y and Z are all C;

    -   3.112. any of formulae 3.81, 3.83-3.110, wherein either X, Y         and/or Z are/is N;

    -   3.113. Any of the preceding formulae, wherein R₆ is H or         C₁₋₆alkyl (e.g., ethyl);

    -   3.114. Formula 3.113, wherein R₆ is H;

    -   3.115. Formula 3.113, wherein R₆ is C₁₋₆alkyl;

    -   3.116. Formula 3.113, wherein ethyl;

    -   3.117. any of Formulae 1.1-3.116 wherein R₄ and R₅ are         independently selected from         -   H,         -   C₁₋₆alkyl (e.g., methyl or isopropyl),         -   C₃₋₉cycloalkyl (e.g., cyclopentyl),         -   C₃₋₉heterocycloalkyl (e.g., pyrrolidin-3-yl),         -   heteroaryl (e.g., pyrid-2-yl, pyrid-3-yl or pyrid-4-yl,             pyrazol-3-yl),         -   aryl (e.g., phenyl) or arylC₁₋₆alkyl (e.g., benzyl), wherein             the aryl group is optionally substituted with one or more             halo (e.g., F or Cl), hydroxy and/or another aryl, (e.g.,             p-benzylaryl, e.g., biphenyl-4-ylmethyl);

    -   3.118. Formula 3.117 wherein R₄ or R₅ is H;

    -   3.119. Formula 3.118 wherein R₄ or R₅ is C₁₋₆alkyl (e.g., methyl         or isopropyl);

    -   3.120. Formula 3.119 wherein R₄ or R₅ is C₃₋₉cycloalkyl (e.g.,         cyclopentyl);

    -   3.121. Formula 3.120 wherein R₄ or R₅ is C₃₋₉heterocycloalkyl         (e.g., pyrrolidin-3-yl);

    -   3.122. Formula 3.121 wherein R₄ or R₅ is heteroaryl (e.g.,         pyrid-2-yl, pyrid-3-yl or pyrid-4-yl, pyrazol-3-yl);

    -   3.123. Formula 3.122 wherein R₄ or R₅ is aryl (e.g., phenyl) or         arylC₁₋₆alkyl (e.g., benzyl), wherein the aryl group is         optionally substituted with one or more halo (e.g., fluoro),         hydroxy and/or another aryl, (e.g., p-benzylaryl, e.g.,         biphenyl-4-ylmethyl);

    -   3.124. Formula 3.117 wherein R₄ is H, and R₅ is phenyl         optionally substituted with halo, hydroxy and/or another aryl;

    -   3.125. any of the preceding formulae wherein X═O or Sh;

    -   3.126. Formula 3.125, wherein X═O;

    -   3.127. Formula 3.125, wherein X═S;

    -   3.128. any of Formulae 3.1-3.127, wherein the compound is         Compound of Formula P-A;

    -   3.129. any of Formulae 3.1-3.127, wherein the compound is         Compound of Formula P-B;

    -   3.130. any of the preceding formulae wherein the compound is         selected from any of the following:

    -   3.131. any of the preceding formulae wherein the compound is         selected from any of the following:

-   -   3.132. a compound of any one of the preceding formulae wherein         said compound inhibits phosphodiesterase-mediated (e.g.,         PDE1-mediated, especially PDE1B-mediated) hydrolysis of cGMP,         e.g., with an IC₅₀ of less than 25 μM, preferably less than 10         μM, preferably less than 25 μM, preferably less than 1 μM, more         preferably less than 500 nM, preferably less than 200 nM in an         immobilized-metal affinity particle reagent PDE assay, for         example, as described in Example 23.

In a further embodiment, the Compounds of the Invention are the compounds of Formula P-A or P-B as hereinbefore described, wherein:

-   -   (i) X═O;     -   (ii) R₁ is C₁₋₆alkyl (e.g. methyl or ethyl);     -   (iii) R₂ is C₁₋₆alkyl (e.g. isopropyl, isobutyl, 2-methylbutyl,         2,2-dimethyl propyl);     -   (iv) R₃ is a moiety of Formula A as described above in Formula         P-A and P-B, wherein X, Y, Z, R₈, R₉, R₁₁ and R₁₂ are previously         defined and R₁₀ is C₁₋₆alkoxy (e.g., methoxy),         -   aryl (e.g., phenyl) or heteroaryl (e.g. pyridyl, for             example, pyrid-2-yl) or wherein said aryl and heteroaryl are             independently and optionally substituted with one or more             halo (e.g., fluoro);         -   heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl,             pyrrolidinyl, pyrrolidinylmethyl) wherein said             heterocycloalkyl is optionally substituted with one or more             C₁₋₆alkyl (e.g., methyl), for example, pyrrolidin-1-yl,             pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl, piperidin-2-yl,             1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;     -   (v) R₄ is aryl (e.g., phenyl) optionally substituted with one or         more halo (e.g., F or Cl), hydroxy and/or another aryl;     -   (vi) R₅ is H;     -   (vii) R₆ is H,         in free or salt form.

In still a further embodiment, the Compounds of the Invention are the compounds of Formula P-A or P-B, wherein:

-   -   (i) X═O;     -   (ii) R₁ is methyl;     -   (iii) R₂ is C₁₋₆alkyl (e.g. isopropyl, isobutyl, 2-methylbutyl,         2,2-dimethyl propyl);     -   (iv) R₃ is a moiety of Formula A as described above in Formula         P-A and P-B, wherein X, Y, Z are C, R₈, R₉, R₁₁ and R₁₂ are         previously defined and R₁₀ is         -   aryl (e.g., phenyl) or heteroaryl (e.g. pyridyl, for             example, pyrid-2-yl) or wherein said aryl and heteroaryl are             independently and optionally substituted with one or more             halo (e.g., fluoro); or         -   heteroC₃₋₉cycloalkyl-C₀₋₆alkyl (e.g., piperidinyl,             pyrrolidinyl, pyrrolidinylmethyl) wherein said             heterocycloalkyl is optionally substituted with one or more             C₁₋₆alkyl (e.g., methyl), for example, pyrrolidin-1-yl,             pyrrolidin-2-yl, 1-methylpyrrolidin-2-yl, piperidin-2-yl,             1-methylpiperidin-2-yl, 1-ethylpiperidin-2-yl;     -   (v) R₄ is phenyl optionally substituted with one or more halo         (e.g., F or Cl), hydroxy and/or another aryl;     -   (vi) R₅ is H;     -   (vii) R₆ is H,         in free or salt form.

If not otherwise specified or clear from context, the following terms herein have the following meanings:

-   -   (a) “Alkyl” as used herein is a saturated or unsaturated         hydrocarbon moiety, preferably saturated, preferably having one         to six carbon atoms, which may be linear or branched, and may be         optionally mono-, di- or tri-substituted, e.g., with halogen         (e.g., chloro or fluoro), hydroxy, or carboxy.     -   (b) “Cycloalkyl” as used herein is a saturated or unsaturated         nonaromatic hydrocarbon moiety, preferably saturated, preferably         comprising three to eight carbon atoms, at least some of which         form a nonaromatic mono- or bicyclic, or bridged cyclic         structure, and which may be optionally substituted, e.g., with         halogen (e.g., chloro or fluoro), hydroxy, or carboxy. Wherein         the cycloalkyl optionally contains one or more atoms selected         from N and O and/or S, said cycloalkyl may also be a         heterocycloalkyl.     -   (c) “Heterocycloalkyl” is, unless otherwise indicated, saturated         or unsaturated nonaromatic hydrocarbon moiety, preferably         saturated, preferably comprising three to nine carbon atoms, at         least some of which form a nonaromatic mono- or bicyclic, or         bridged cyclic structure, wherein at least one carbon atom is         replaced with N, O or S, which heterocycloalkyl may be         optionally substituted, e.g., with halogen (e.g., chloro or         fluoro), hydroxy, or carboxy.     -   (d) “Aryl” as used herein is a mono or bicyclic aromatic         hydrocarbon, preferably phenyl, optionally substituted, e.g.,         with alkyl (e.g., methyl), halogen (e.g., chloro or fluoro),         haloalkyl (e.g., trifluoromethyl), hydroxy, carboxy, or an         additional aryl or heteroaryl (e.g., biphenyl or pyridylphenyl).     -   (e) “Heteroaryl” as used herein is an aromatic moiety wherein         one or more of the atoms making up the aromatic ring is sulfur         or nitrogen rather than carbon, e.g., pyridyl or thiadiazolyl,         which may be optionally substituted, e.g., with alkyl, halogen,         haloalkyl, hydroxy or carboxy.     -   (f) Wherein E is phenylene, the numbering is as follows:

-   -   (g) It is intended that wherein the substituents end in “ene”,         for example, alkylene, phenylene or arylalkylene, said         substitutents are intended to bridge or be connected to two         other substituents. Therefore, methylene is intended to be —CH₂—         and phenylene intended to be —C₆H₄— and arylalkylene is intended         to be —C₆H₄—CH₂— or —CH₂—C₆H₄—.     -   (h) For ease of reference, the atoms on the pyrolo-pyrimidine         core of the Compounds of the Invention are numbered in         accordance with the numbering depicted below, unless otherwise         noted.

Compounds of the Invention may exist in free or salt form, e.g., as acid addition salts. In this specification unless otherwise indicated, language such as “Compounds of the Invention” is to be understood as embracing the compounds e.g., Compound of Formula I, or any of 1.11.127, a Compound of Formula I(i) or I(ii), a Compound of Formula II, e.g., any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132, in any form, for example, in free or acid addition salt form, or where the compounds contain acidic substituents, in base addition salt form. The Compounds of the Invention are intended for use as pharmaceuticals, therefore pharmaceutically acceptable salts are preferred. Salts which are unsuitable for pharmaceutical uses may be useful, for example, for the isolation or purification of free Compounds of the Invention or their pharmaceutically acceptable salts, are therefore also included.

Compounds of the Invention may in some cases also exist in prodrug form. A prodrug form is compound which converts in the body to a Compound of the Invention. For example, when the Compounds of the Invention contain hydroxy or carboxy substituents, these substituents may form physiologically hydrolysable and acceptable esters. As used herein, “physiologically hydrolysable and acceptable ester” means esters of Compounds of the Invention which are hydrolysable under physiological conditions to yield acids (in the case of Compounds of the Invention which have hydroxy substituents) or alcohols (in the case of Compounds of the Invention which have carboxy substituents) which are themselves physiologically tolerable at doses to be administered. Therefore, wherein the Compound of the Invention contains a hydroxy group, for example, Compound-OH, the acyl ester prodrug of such compound, i.e., Compound-O—C(O)—C₁₋₄alkyl, can hydrolyze in the body to form physiologically hydrolysable alcohol (Compound-OH) on the one hand and acid on the other (e.g., HOC(O)—C₁₋₄alkyl). Alternatively, wherein the Compound of the Invention contains a carboxylic acid, for example, Compound-C(O)OH, the acid ester prodrug of such compound, Compound-C(O)O—C₁₋₄alkyl can hydrolyze to form Compound-C(O)OH and HO—C₁₋₄alkyl. As will be appreciated, the term thus embraces conventional pharmaceutical prodrug forms.

The invention also provides methods of making the Compounds of the Invention and methods of using the Compounds of the Invention for treatment of diseases and disorders as set forth below (especially treatment of diseases characterized by reduced dopamine D1 receptor signaling activity, such as Parkinson's disease, Tourette's Syndrome, Autism, fragile X syndrome, ADHD, restless leg syndrome, depression, cognitive impairment of schizophrenia, narcolepsy and diseases that may be alleviated by the enhancement of progesterone-signaling such as female sexual dysfunction), or a disease or disorder such as psychosis or glaucoma). This list is not intended to be exhaustive and may include other diseases and disorders as set forth below.

In another embodiment, the invention further provides a pharmaceutical composition comprising a Compound of the Invention, e.g., a Compound of Formula I, or any of 1.11.127, or a Compound of Formula I(i) or I(ii), in free or pharmaceutically acceptable salt form, in admixture with a pharmaceutically acceptable carrier. In another embodiment, the invention further provides a pharmaceutical composition comprising a Compound of the Invention, e.g., a Compound of Formula II, or any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132, in free or pharmaceutically acceptable salt form, in admixture with a pharmaceutically acceptable carrier.

DETAILED DESCRIPTION OF THE INVENTION

Methods of Making Compounds of the Invention

The Compounds of the Invention and their pharmaceutically acceptable salts may be made using the methods as described and exemplified herein and by methods similar thereto and by methods known in the chemical art. Such methods include, but not limited to, those described below. If not commercially available, starting materials for these processes may be made by procedures, which are selected from the chemical art using techniques which are similar or analogous to the synthesis of known compounds. In particular, the intermediates and starting materials for the Compounds of the Invention may be prepared by methods and processes as described in PCT/US2007/070551. All references cited herein are hereby incorporated by reference in their entirety.

The Compounds of the Invention include their enantiomers, diastereoisomers, tautomers and racemates, as well as their polymorphs, hydrates, solvates and complexes. Some individual compounds within the scope of this invention may contain double bonds. Representations of double bonds in this invention are meant to include both the E and the Z isomer of the double bond. In addition, some compounds within the scope of this invention may contain one or more asymmetric centers. This invention includes the use of any of the optically pure stereoisomers as well as any combination of stereoisomers.

It is also intended that the Compounds of the Invention encompass their stable and unstable isotopes. Stable isotopes are nonradioactive isotopes which contain one additional neutron compared to the abundant nuclides of the same species (i.e., element). It is expected that the activity of compounds comprising such isotopes would be retained, and such compound would also have utility for measuring pharmacokinetics of the non-isotopic analogs. For example, the hydrogen atom at a certain position on the Compounds of the Invention may be replaced with deuterium (a stable isotope which is non-raradioactive). Examples of known stable isotopes include, but not limited to, deuterium, ¹³C, ¹⁵N, ¹⁸O. Alternatively, unstable isotopes, which are radioactive isotopes which contain additional neutrons compared to the abundant nuclides of the same species (i.e., element), e.g., ¹²³I, ¹³¹I, ¹²⁵I, ¹¹C, ¹⁸F, may replace the corresponding abundant species of I, C and F. Another example of useful isotope of the compound of the invention is the ¹¹C isotope. These radio isotopes are useful for radio-imaging and/or pharmacokinetic studies of the compounds of the invention.

Melting points are uncorrected and (dec) indicates decomposition. Temperature are given in degrees Celsius (° C.); unless otherwise stated, operations are carried out at room or ambient temperature, that is, at a temperature in the range of 18-25° C. Chromatography means flash chromatography on silica gel; thin layer chromatography (TLC) is carried out on silica gel plates. NMR data is in the delta values of major diagnostic protons, given in parts per million (ppm) relative to tetramethylsilane (TMS) as an internal standard. Conventional abbreviations for signal shape are used. Coupling constants (J) are given in Hz. For mass spectra (MS), the lowest mass major ion is reported for molecules where isotope splitting results in multiple mass spectral peaks Solvent mixture compositions are given as volume percentages or volume ratios. In cases where the NMR spectra are complex, only diagnostic signals are reported.

TERMS AND ABBREVIATIONS

BuLi=n-butyllithium

BAH=tert-butyl alcohol,

CAN=ammonium cerium (IV) nitrate,

DIPEA=diisopropylethylamine,

DMF=N,N-dimethylforamide,

DMSO=dimethyl sulfoxide,

Et₂O=diethyl ether,

EtOAc=ethyl acetate,

equiv.=equivalent(s),

h=hour(s),

HPLC=high performance liquid chromatography,

LDA=lithium diisopropylamide

MeOH=methanol,

NBS=N-bromosuccinimide

NCS=N-chlorosuccinimide

NaHCO₃=sodium bicarbonate,

NH₄OH=ammonium hydroxide,

Pd₂(dba)₃=tris[dibenzylideneacetone]dipalladium(0)

PMB=p-methoxybenzyl,

POCl₃=phosphorous oxychloride,

SOCl₂=thionyl chloride,

TFA=trifluoroacetic acid,

THF=tetrahedrofuran.

The synthetic methods in this invention are illustrated below. The significances for the R groups are as set forth above for formula I unless otherwise indicated.

In an aspect of the invention, compounds (1)-A and (1)-B may be formed by reacting a compound of 1-A and 1-B respectively with for example a R₃—X in a solvent such as DMF and a base such as K₂CO₃ or cesium carbonate at room temperature or with heating:

wherein all the substitutents are as defined previously; X is a leaving group such as a halogen, mesylate, or tosylate.

Alternatively, compounds (I)-A and (I)-B may be synthesized by reacting a compound of 1-C and 1-D respectively with for example a R₄R₅NH in a solvent such as DMF or in neat condition with heating. 1-C or 1-D can react with R₄NH₂ at first to give 1-E or 1-F, and then 1-E or 1-F may react with R₅—X to give (I)-A or (I)-B.

wherein all the substituents are as defined previously; X is a leaving group such as a halogen group.

Compound 1-C, e.g., wherein Q is C(═O) and X is a chloro group, may be prepared by, e.g., reacting compound 1-G with a chlorinating reagent such as hexachloroethane in the presence of a strong base or lithium reagent such as LiHMDS. Compound 1-D, e.g., wherein Q is C(═O) and X is a chloro group, may be prepared by, e.g., reacting compound 1-H with a chlorinating reagent such NCS in a solvent such as CCl₄. Sometimes, R₃ can be a protective group such as a para-methoxybenzyl (PMB) group. Under this circumstance, compound 1-C or 1-D with the PMB substituent as R₃ can be deprotected using a reagent such as TFA/TFMSA, and then reacts with a different R₃-L under basic conditions for rapidly synthesizing 1-C or 1-D analogs.

Compounds (I)-G and (I)-H may be formed by reacting a compound of (I)-I and (I)-J respectively with for example a R₃-L in a solvent such as DMF and a base such as K₂CO₃ at room temperature or with heating:

wherein all the substituents are as defined previously; L is a leaving group such as a halogen group.

(1,3-optionally substituted)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione cores, e.g., Intermediate 2, may be prepared by reacting (1,3-optionally substituted)-pyrimidine-2,4-dione, e.g., Intermediate 1, e.g., with sodium hydride and para-toluenesulfonylmethyl isocyanide.

Alternatively, (1,3-optionally substituted)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione cores, e.g., Intermediate 2 wherein Q is C(═O), may be prepared by reacting (1,3-optionally substituted)-pyrimidine-2,4-dione, e.g., Intermediate 1, e.g., with a strong base such as sodium hydride and a reagent such as TsCHR₆NC in a solvent such as THF. Alternatively, intermediate 1 may react with para-toluenesulfonylmethyl isocyanide to construct the pyrrole ring, and the substituent R₆ may introduced at later steps.

Intermediate 3-A and 3-B may be formed by reacting compound 2-A and 2-B with for example a R₃—X in a solvent such as DMF and a base such as K₂CO₃ or cesium carbonate at room temperature or with heating.

Compound 4-A and 4-B, wherein X is halo, e.g., Cl, Br or I, may be prepared by halogenating compound 3-A and 3-B. For example, compound 4-A may be formed by reacting Compound 3-A with, e.g., N-chlorosuccinimide (NCS), hexachloroethane, N-bromosuccinimide (NBS), N-iodosuccinimide (NIS) or I₂ in a solvent such as THF and a base such as LiHMDS, LDA or BuLi at room or low temperature. Compound 4-B may be prepared by, e.g., reacting compound 3-B with a chlorinating reagent such NCS in a solvent such as CCl₄.

Compound (I)-A and (I)-B wherein Q is C(═O) may then be prepared by reacting a compound of 4-A and 4-B respectively with, for example an HN(R₄)(R₅) at elevated temperature. The reaction may be accelerated by adding a catalytic amount of acid such as trichloroacetic acid (TCA).

Alternatively, Compound 5-A or 5-B may be formed by the amination of 4-A or 4-B with R₄NH₂ or R₅NH₂ to give IIIc or IVd under basic conditions upon heating, and then IIIc or IVd may react with R₅-L or R₄-L under basic conditions to give compound 5-A or 5-B.

wherein all the substituents are as defined previously; L is a leaving group such as a halogen group.

Compound 5-A or 5-B may also be synthesized from protected intermediate 6-A or 6-B. After deprotection, the obtained intermediate 7-A or 7-B can react with R₂-L in a solvent such as DMF and a base such as K₂CO₃ at room temperature or with heating to give compound 5-A or 5-B.

wherein all the substituents are as defined previously; L is a leaving group such as a halogen group; P₂ is a protective group, such as para-methoxy benzyl (PMB) group.

The 4-thioxo Compounds of the invention, e.g., Compounds of Formula (I) wherein Q is C(═S) may then be prepared by reacting compound 5-A or 5-B with P₄S₁₀ in a microwave vial in the presence of a base, e.g., pyridine, and heating the mixture to an elevated temperature, e.g., in a microwave, e.g., to about 150° C. The invention thus provides methods of making a 4-thioxo Compound of the Invention, Compound of Formula (I) wherein Q of is C(═S) as hereinbefore described, for example, comprising reacting an optionally substituted 3,4-dihydro-1H-pyrrolo[3,4-d]pyrimidin-2(6H)-one of Formula I with P₄S₁₀ in the presence of a base, e.g., pyridine, and heating the reaction mixture to an elevated temperature, e.g., to >50° C., e.g., >100° C., e.g., >150° C., for example, in a microwave to about 150° C.

The 4-imino Compounds of the Invention, e.g., Compounds of Formula (I) wherein Q is C(═N(R₆)) or Formula II wherein Q is C(═N(R₇)) may in turn be converted from the 4-thioxo derivative (i.e., Compounds of Formula (I) wherein with Q is X(═S) by reacting the 4-thioxo derivative with NH₂(R₆) or Formula II wherein Q is C(═N(R₇)) in the presence of HgCl₂, e.g., in a solvent such as THF, and heating the reaction mixture to an elevated temperature, e.g., in a microwave, e.g., to about 110° C. The invention also provides methods of making 4-imino Compounds of the Invention, e.g., Compounds of Formula I, wherein Q of Formula I is C(═N(R₆)) or Formula II wherein Q is C(═N(R₇)) as hereinbefore described, for example, comprising reacting a the Compound of Formula I wherein Q is C(═S), with NH₂(R₆) or Formula II wherein Q is C(═N(R₇)) in the presence of HgCl₂, e.g., in a solvent such as THF, and heating the reaction mixture in a microwave, e.g., to >50° C., e.g., >75° C., e.g., >100° C., for example, in a microwave to about 110° C.

The Compounds of the Invention, e.g., Compounds of Formula (I) wherein Q is CH₂ may also be prepared by reacting compound 5-A or 5-B with a reducing agent, e.g., diisobutylaluminum hydride (DIBAL-H), lithium aluminum hydride, sodium borohydride, preferably, DIBAL-H. The invention therefore provides methods of making the Compounds of the Invention, e.g., Compounds of Formula I, wherein Q is CH₂ comprising reacting compound 5-A or 5-B with a reducing agent, e.g., diisobutylaluminum hydride (DIBAL-H), lithium aluminum hydride, sodium borohydride, preferably, DIBAL-H.

Methods of using Compounds of the Invention

The Compounds of the Invention are useful in the treatment of diseases characterized by disruption of or damage to cAMP and cGMP mediated pathways, e.g., as a result of increased expression of PDE1 or decreased expression of cAMP and cGMP due to inhibition or reduced levels of inducers of cyclic nucleotide synthesis, such as dopamine and nitric oxide (NO). By preventing the degradation of cAMP and cGMP by PDEIB, thereby increasing intracellular levels of cAMP and cGMP, the Compounds of the Invention potentiate the activity of cyclic nucleotide synthesis inducers.

The invention provides methods of treatment of any one or more of the following conditions:

-   -   (i) Neurodegenerative diseases, including Parkinson's disease,         restless leg, tremors, dyskinesias, Huntington's disease,         Alzheimer's disease, and drug-induced movement disorders;     -   (ii) Mental disorders, including depression, attention deficit         disorder, attention deficit hyperactivity disorder, bipolar         illness, anxiety, sleep disorders, e.g., narcolepsy, cognitive         impairment, dementia, Tourette's syndrome, autism, fragile X         syndrome, psychostimulant withdrawal, and drug addiction;     -   (iii) Circulatory and cardiovascular disorders, including         cerebrovascular disease, stroke, congestive heart disease,         hypertension, pulmonary hypertension, and sexual dysfunction;     -   (iv) Respiratory and inflammatory disorders, including asthma,         chronic obstructive pulmonary disease, and allergic rhinitis, as         well as autoimmune and inflammatory diseases;     -   (v) Any disease or condition characterized by low levels of cAMP         and/or cGMP (or inhibition of cAMP and/or cGMP signaling         pathways) in cells expressing PDE1; and/or     -   (vi) Any disease or condition characterized by reduced dopamine         D1 receptor signaling activity,         comprising administering an effective amount of a Compound of         the Invention, e.g., a compound according to any of Formula I or         1-1.127, or a composition comprising a Compound of the         Invention, e.g., a compound according to any of Formula I or         1-1.127, to a human or animal patient in need thereof. In         another aspect, the invention provides a method of treatment of         the conditions disclosed above comprising administering a         therapeutically effective amount of a Compound of Formula II, or         any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132, as         hereinbefore described, in free or pharmaceutically acceptable         salt form, to a human or animal patient in need thereof.

In an especially preferred embodiment, the invention provides methods of treatment or prophylaxis for narcolepsy. In this embodiment, PDE 1 Inhibitors may be used as a sole therapeutic agent, but may also be used in combination or for co-administration with other active agents. Thus, the invention further comprises a method of treating narcolepsy comprising administering simultaneously, sequentially, or contemporaneously administering therapeutically effective amounts of

-   -   (i) a PDE 1 Inhibitor of the Invention, e.g., a compound         according to any of Formula I or 1.1-1.127, or I(i) or I(ii);         and     -   (ii) a compound to promote wakefulness or regulate sleep, e.g.,         selected from (a) central nervous system stimulants-amphetamines         and amphetamine like compounds, e.g., methylphenidate,         dextroamphetamine, methamphetamine, and pemoline; (b)         modafinil, (c) antidepressants, e.g., tricyclics (including         imipramine, desipramine, clomipramine, and protriptyline) and         selective serotonin reuptake inhibitors (including fluoxetine         and sertraline); and/or (d) gamma hydroxybutyrate (GHB),         in free or pharmaceutically acceptable salt form, to a human or         animal patient in need thereof. In another embodiment, the         invention provides methods of treatment or prophylaxis for         narcolepsy as herein before described, wherein the PDE1         inhibitor is in a form of a pharmaceutical composition. In still         another embodiment, the methods of treatment or prophylaxis for         narcolepsy as hereinbefore described, comprises administering a         therapeutically effective amount of a Compound of Formula II, or         any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132 as         hereinbefore described, in free or pharmaceutically acceptable         salt form, as a sole therapeutic agent or use in combination for         co-administered with another active agent.

In another embodiment, the invention further provides methods of treatment or prophylaxis of a condition which may be alleviated by the enhancement of the progesterone signaling comprising administering an effective amount of a Compound of the Invention, e.g., a compound according to any of Formula 1-1.127 or Formula I, I(i) or I(ii) in free or pharmaceutically acceptable salt form, to a human or animal patient in need thereof. The invention also provides methods of treatment as disclosed here, comprising administering a therapeutically effective amount of a Compound of Formula II, or any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132 as hereinbefore described, in free or pharmaceutically acceptable salt form. Disease or condition that may be ameliorated by enhancement of progesterone signaling include, but are not limited to, female sexual dysfunction, secondary amenorrhea (e.g., exercise amenorrhoea, anovulation, menopause, menopausal symptoms, hypothyroidism), pre-menstrual syndrome, premature labor, infertility, for example infertility due to repeated miscarriage, irregular menstrual cycles, abnormal uterine bleeding, osteoporosis, autoimmmune disease, multiple sclerosis, prostate enlargement, prostate cancer, and hypothyroidism. For example, by enhancing progesterone signaling, the PDE 1 inhibitors may be used to encourage egg implantation through effects on the lining of uterus, and to help maintain pregnancy in women who are prone to miscarriage due to immune response to pregnancy or low progesterone function. The novel PDE 1 inhibitors, e.g., as described herein, may also be useful to enhance the effectiveness of hormone replacement therapy, e.g., administered in combination with estrogen/estradiol/estriol and/or progesterone/progestins in postmenopausal women, and estrogen-induced endometrial hyperplasia and carcinoma. The methods of the invention are also useful for animal breeding, for example to induce sexual receptivity and/or estrus in a nonhuman female mammal to be bred.

In this embodiment, PDE 1 Inhibitors may be used in the foregoing methods of treatment or prophylaxis as a sole therapeutic agent, but may also be used in combination or for co-administration with other active agents, for example in conjunction with hormone replacement therapy. Thus, the invention further comprises a method of treating disorders that may be ameliorated by enhancement of progesterone signaling comprising administering simultaneously, sequentially, or contemporaneously administering therapeutically effective amounts of

-   -   (i) a PDE 1 Inhibitor, e.g., a compound according to any of         Formula 1.1-1.127 or Formula I, and     -   (ii) a hormone, e.g., selected from estrogen and estrogen         analogues (e.g., estradiol, estriol, estradiol esters) and         progesterone and progesterone analogues (e.g., progestins)         in free or pharmaceutically acceptable salt form, to a human or         animal patient in need thereof. In another embodiment, the         invention provides the method described above wherein the PDE 1         inhibitor is a Compound of Formula II, or any of 2.1-2.24,         Formula P-A or P-B, or any of 3.1-3.132 as hereinbefore         described, in free or pharmaceutically acceptable salt form.

The invention also provides a method for enhancing or potentiating dopamine D1 intracellular signaling activity in a cell or tissue comprising contacting said cell or tissue with an amount of a Compound of the Invention sufficient to inhibit PDE1B activity. The invention further provides a method for enhancing or potentiating dopamine D1 intracellular signaling activity in a cell or tissue comprising contacting said cell or tissue with an amount of a Compound of Formula II, or any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132 as hereinbefore described, in free or salt form, sufficient to inhibit PDE1 activity, e.g., PDE1A or PDE1B activity.

The invention also provides a method for enhancing or potentiating progesterone signaling activity in a cell or tissue comprising contacting said cell or tissue with an amount of a Compound of the Invention sufficient to inhibit PDE I B activity.

The invention also provides a method for treating a PDE1-related, especially PDE1B-related disorder, a dopamine D1 receptor intracellular signaling pathway disorder, or disorders that may be alleviated by the enhancement of the progesterone signaling pathway in a patient in need thereof comprising administering to the patient an effective amount of a Compound of the Invention that inhibits PDE1B, wherein PDE1B activity modulates phosphorylation of DARPP-32 and/or the GluR1 AMPA receptor. Similarly, the invention provides a method for treating a PDE1-related, especially PDE1B-related disorder, a dopamine D1 receptor intracellular signaling pathway disorder, or disorders that may be alleviated by the enhancement of the progesterone signaling pathway in a patient in need thereof comprising administering to the patient an effective amount of a Compound of Formula II or any of 2.1-2.24, Formula P-A or P-B, or any of 3.1-3.132 as hereinbefore described, in free or pharmaceutically acceptable salt form.

In another aspect, the invention also provides a method for the treatment for glaucoma or elevated intraocular pressure comprising topical administration of a therapeutically effective amount of a phospodiesterase type I (PDE1) Inhibitor of the Invention, in free or pharmaceutically acceptable salt form, in an opthalmically compatible carrier to the eye of a patient in need thereof. However, treatment may alternatively include a systemic therapy. Systemic therapy includes treatment that can directly reach the bloodstream, or oral methods of administration, for example.

The invention further provides a pharmaceutical composition for topical ophthalmic use comprising a PDE1 inhibitor; for example an ophthalmic solution, suspension, cream or ointment comprising a PDE1 Inhibitor of the Invention, in free or ophthamalogically acceptable salt form, in combination or association with an ophthamologically acceptable diluent or carrier.

Optionally, the PDE1 inhibitor may be administered sequentially or simultaneously with a second drug useful for treatment of glaucoma or elevated intraocular pressure. Where two active agents are administered, the therapeutically effective amount of each agent may be below the amount needed for activity as monotherapy. Accordingly, a subthreshold amount (i.e., an amount below the level necessary for efficacy as monotherapy) may be considered therapeutically effective and also may also be referred alternatively as an effective amount. Indeed, an advantage of administering different agents with different mechanisms of action and different side effect profiles may be to reduce the dosage and side effects of either or both agents, as well as to enhance or potentiate their activity as monotherapy.

The invention thus provides the method of treatment of a condition selected from glaucoma and elevated intraocular pressure comprising administering to a patient in need thereof an effective amount, e.g., a subthreshold amount, of an agent known to lower intraocular pressure concomitantly, simultaneously or sequentially with an effective amount, e.g., a subthreshold amount, of a PDE1 Inhibitor of the Invention, in free or pharmaceutically acceptable salt form, such that amount of the agent known to lower intraocular pressure and the amount of the PDE1 inhibitor in combination are effective to treat the condition.

In one embodiment, one or both of the agents are administered topically to the eye. Thus the invention provides a method of reducing the side effects of treatment of glaucoma or elevated intraocular pressure by administering a reduced dose of an agent known to lower intraocular pressure concomitantly, simultaneously or sequentially with an effective amount of a PDE1 inhibitor. However, methods other than topical administration, such as systemic therapeutic administration, may also be utilized.

The optional additional agent or agents for use in combination with a PDE1 inhibitor may, for example, be selected from the existing drugs comprise typically of instillation of a prostaglandin, pilocarpine, epinephrine, or topical beta-blocker treatment, e.g. with timolol, as well as systemically administered inhibitors of carbonic anhydrase, e.g. acetazolamide. Cholinesterase inhibitors such as physostigmine and echothiopate may also be employed and have an effect similar to that of pilocarpine. Drugs currently used to treat glaucoma thus include, e.g.,

-   -   1. Prostaglandin analogs such as latanoprost (Xalatan),         bimatoprost (Lumigan) and travoprost (Travatan), which increase         uveoscleral outflow of aqueous humor. Bimatoprost also increases         trabecular outflow.     -   2. Topical beta-adrenergic receptor antagonists such as timolol,         levobunolol (Betagan), and betaxolol, which decrease aqueous         humor production by the ciliary body.     -   3. Alpha₂-adrenergic agonists such as brimonidine (Alphagan),         which work by a dual mechanism, decreasing aqueous production         and increasing uveo-scleral outflow.     -   4. Less-selective sympathomimetics like epinephrine and         dipivefrin (Propine) increase outflow of aqueous humor through         trabecular meshwork and possibly through uveoscleral outflow         pathway, probably by a beta₂-agonist action.     -   5. Miotic agents (parasympathomimetics) like pilocarpine work by         contraction of the ciliary muscle, tightening the trabecular         meshwork and allowing increased outflow of the aqueous humour.     -   6. Carbonic anhydrase inhibitors like dorzolamide (Trusopt),         brinzolamide (Azopt), acetazolamide (Diamox) lower secretion of         aqueous humor by inhibiting carbonic anhydrase in the ciliary         body.     -   7. Physostigmine is also used to treat glaucoma and delayed         gastric emptying.

For example, the invention provides pharmaceutical compositions comprising a PDE1 Inhibitor of the Invention and an agent selected from (i) the prostanoids, unoprostone, latanoprost, travoprost, or bimatoprost; (ii) an alpha adrenergic agonist such as brimonidine, apraclonidine, or dipivefrin and (iii) a muscarinic agonist, such as pilocarpine. For example, the invention provides ophthalmic formulations comprising a PDE-1 Inhibitor of the Invention together with bimatoprost, abrimonidine, brimonidine, timolol, or combinations thereof, in free or ophthamalogically acceptable salt form, in combination or association with an ophthamologically acceptable diluent or carrier. In addition to selecting a combination, however, a person of ordinary skill in the art can select an appropriate selective receptor subtype agonist or antagonist. For example, for alpha adrenergic agonist, one can select an agonist selective for an alpha 1 adrenergic receptor, or an agonist selective for an alpha₂ adrenergic receptor such as brimonidine, for example. For a beta-adrenergic receptor antagonist, one can select an antagonist selective for either β₁, or β₂, or β₃, depending on the appropriate therapeutic application. One can also select a muscarinic agonist selective for a particular receptor subtype such as M₁-M₅.

The PDE 1 inhibitor may be administered in the form of an ophthalmic composition, which includes an ophthalmic solution, cream or ointment. The ophthalmic composition may additionally include an intraocular-pressure lowering agent.

In yet another example, the PDE-1 Inhibitors disclosed may be combined with a subthreshold amount of an intraocular pressure-lowering agent which may be a bimatoprost ophthalmic solution, a brimonidine tartrate ophthalmic solution, or brimonidine tartrate/timolol maleate ophthalmic solution.

In addition to the above-mentioned methods, it has also been surprisingly discovered that PDE1 inhibitors are useful to treat psychosis, for example, any conditions characterized by psychotic symptoms such as hallucinations, paranoid or bizarre delusions, or disorganized speech and thinking, e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, and mania, such as in acute manic episodes and bipolar disorder. Without intending to be bound by any theory, it is believed that typical and atypical antipsychotic drugs such as clozapine primarily have their antagonistic activity at the dopamine D2 receptor. PDE1 inhibitors, however, primarily act to enhance signaling at the dopamine D1 receptor. By enhancing D1 receptor signaling, PDE1 inhibitors can increase NMDA receptor function in various brain regions, for example in nucleus accumbens neurons and in the prefrontal cortex. This enhancement of function may be seen for example in NMDA receptors containing the NR2B subunit, and may occur e.g., via activation of the Src and protein kinase A family of kinases.

Therefore, the invention provides a new method for the treatment of psychosis, e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, and mania, such as in acute manic episodes and bipolar disorder, comprising administering a therapeutically effective amount of a phosphodiesterase-1 (PDE1) Inhibitor of the Invention, in free or pharmaceutically acceptable salt form, to a patient in need thereof.

PDE 1 Inhibitors may be used in the foregoing methods of treatment prophylaxis as a sole therapeutic agent, but may also be used in combination or for co-administration with other active agents. Thus, the invention further comprises a method of treating psychosis, e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, or mania, comprising administering simultaneously, sequentially, or contemporaneously administering therapeutically effective amounts of:

-   -   (i) a PDE 1 Inhibitor of the invention, in free or         pharmaceutically acceptable salt form; and     -   (ii) an antipsychotic, e.g.,         -   Typical antipsychotics, e.g.,             -   Butyrophenones, e.g. Haloperidol (Haldol, Serenace),                 Droperidol (Droleptan);             -   Phenothiazines, e.g., Chlorpromazine (Thorazine,                 Largactil), Fluphenazine (Prolixin), Perphenazine                 (Trilafon), Prochlorperazine (Compazine), Thioridazine                 (Mellaril, Melleril), Trifluoperazine (Stelazine),                 Mesoridazine, Periciazine, Promazine, Triflupromazine                 (Vesprin), Levomepromazine (Nozinan), Promethazine                 (Phenergan), Pimozide (Orap);             -   Thioxanthenes, e.g., Chlorprothixene, Flupenthixol                 (Depixol, Fluanxol), Thiothixene (Navane),                 Zuclopenthixol (Clopixol, Acuphase);         -   Atypical antipsychotics, e.g.,             -   Clozapine (Clozaril), Olanzapine (Zyprexa), Risperidone                 (Risperdal), Quetiapine (Seroquel), Ziprasidone                 (Geodon), Amisulpride (Solian), Paliperidone (Invega),                 Aripiprazole (Abilify), Bifeprunox; norclozapine,

in free or pharmaceutically acceptable salt form, to a patient in need thereof.

In a particular embodiment, the Compounds of the Invention are particularly useful for the treatment or prophylaxis of schizophrenia.

Compounds of the Invention, in free or pharmaceutically acceptable salt form, are particularly useful for the treatment of Parkinson's disease, schizophrenia, narcolepsy, glaucoma and female sexual dysfunction.

In still another aspect, the invention provides a method of lengthening or enhancing growth of the eyelashes by administering an effective amount of a prostaglandin analogue, e.g., bimatoprost, concomitantly, simultaneously or sequentially with an effective amount of a PDE1 inhibitor of the Invention, in free or pharmaceutically acceptable salt form, to the eye of a patient in need thereof.

In yet another aspect, the invention provides a method for the treatment or prophylaxis of traumatic brain injury comprising administering a therapeutically effective amount of a PDE1 inhibitor of the invention, in free or pharmaceutically acceptable salt form, to a patient in need thereof. Traumatic brain injury (TBI) encompasses primary injury as well as secondary injury, including both focal and diffuse brain injuries. Secondary injuries are multiple, parallel, interacting and interdependent cascades of biological reactions arising from discrete subcellular processes (e.g., toxicity due to reactive oxygen species, overstimulation of glutamate receptors, excessive influx of calcium and inflammatory upregulation) which are caused or exacerbated by the inflammatory response and progress after the initial (primary) injury. Abnormal calcium homeostasis is believed to be a critical component of the progression of secondary injury in both grey and white matter. For a review of TBI, see Park et al., CMAJ (2008) 178(9):1163-1170, the contents of which are incorporated herein in their entirety. Studies have shown that the cAMP-PKA signaling cascade is down-regulated after TBI and treatment of PDE IV inhibitors such as rolipram to raise or restore cAMP level improves histopathological outcome and decreases inflammation after TBI. As Compounds of the present invention is a PDE1 inhibitor useful for modulating cAMP and/or calcium levels, it is believed that these compounds are also useful for the treatment of TBI, e.g., by restoring cAMP level and/or calcium homeostasis after traumatic brain injury.

The present invention also provides

-   -   (i) a Compound of the Invention for use as a pharmaceutical, for         example for use in any method or in the treatment of any disease         or condition as hereinbefore set forth,     -   (ii) the use of a Compound of the Invention in the manufacture         of a medicament for treating any disease or condition as         hereinbefore set forth,     -   (iii) a pharmaceutical composition comprising a Compound of the         Invention in combination or association with a pharmaceutically         acceptable diluent or carrier, and     -   (iv) a pharmaceutical composition comprising a Compound of the         Invention in combination or association with a pharmaceutically         acceptable diluent or carrier for use in the treatment of any         disease or condition as hereinbefore set forth.

Therefore, the invention provides use of a Compound of the Invention for the manufacture of a medicament for the treatment or prophylactic treatment of the following diseases: Parkinson's disease, restless leg, tremors, dyskinesias, Huntington's disease, Alzheimer's disease, and drug-induced movement disorders; depression, attention deficit disorder, attention deficit hyperactivity disorder, bipolar illness, anxiety, sleep disorder, narcolepsy, cognitive impairment, dementia, Tourette's syndrome, autism, fragile X syndrome, psychostimulant withdrawal, and/or drug addiction; cerebrovascular disease, stroke, congestive heart disease, hypertension, pulmonary hypertension, and/or sexual dysfunction; asthma, chronic obstructive pulmonary disease, and/or allergic rhinitis, as well as autoimmune and inflammatory diseases; and/or female sexual dysfunction, exercise amenorrhoea, anovulation, menopause, menopausal symptoms, hypothyroidism, pre-menstrual syndrome, premature labor, infertility, irregular menstrual cycles, abnormal uterine bleeding, osteoporosis, multiple sclerosis, prostate enlargement, prostate cancer, hypothyroidism, estrogen-induced endometrial hyperplasia or carcinoma; and/or any disease or condition characterized by low levels of cAMP and/or cGMP (or inhibition of cAMP and/or cGMP signaling pathways) in cells expressing PDE1, and/or by reduced dopamine D1 receptor signaling activity; and/or any disease or condition that may be ameliorated by the enhancement of progesterone signaling.

The invention also provides use of a Compound of the Invention, in free or pharmaceutically acceptable salt form, for the manufacture of a medicament for the treatment or prophylactic treatment of:

-   -   a) glaucoma or elevated intraocular pressure,     -   b) psychosis, for example, any conditions characterized by         psychotic symptoms such as hallucinations, paranoid or bizarre         delusions, or disorganized speech and thinking, e.g.,         schizophrenia, schizoaffective disorder, schizophreniform         disorder, psychotic disorder, delusional disorder, and mania,         such as in acute manic episodes and bipolar disorder,     -   c) traumatic brain injury.

The phrase “Compounds of the Invention” or “PDE 1 inhibitors of the Invention” encompasses any and all of the compounds disclosed herewith, e.g., a Compound of Formula I or any of 1.1-1.127, Formula II-A, II-B, or any of 2.1-2.24, and Formula P-A or P-B, or any of 3.1-3.132, in free or salt form.

The words “treatment” and “treating” are to be understood accordingly as embracing prophylaxis and treatment or amelioration of symptoms of disease as well as treatment of the cause of the disease.

For methods of treatment, the word “effective amount” is intended to encompass a therapeutically effective amount to treat a specific disease or disorder.

The term “pulmonary hypertension” is intended to encompass pulmonary arterial hypertension.

The term “patient” include human or non-human (i.e., animal) patient. In particular embodiment, the invention encompasses both human and nonhuman. In another embodiment, the invention encompasses nonhuman. In other embodiment, the term encompasses human.

The term “comprising” as used in this disclosure is intended to be open-ended and does not exclude additional, unrecited elements or method steps.

Compounds of the Invention are in particular useful for the treatment of Parkinson's disease, narcolepsy and female sexual dysfunction.

Compounds of the Invention may be used as a sole therapeutic agent, but may also be used in combination or for co-administration with other active agents. For example, as Compounds of the Invention potentiate the activity of D1 agonists, such as dopamine, they may be simultaneously, sequentially, or contemporaneously administered with conventional dopaminergic medications, such as levodopa and levodopa adjuncts (carbidopa, COMT inhibitors, MAO-B inhibitors), dopamine agonists, and anticholinergics, e.g., in the treatment of a patient having Parkinson's disease. In addition, the novel PDE 1 inhibitors of the Invention, e.g., the Compounds of the Invention as described herein, may also be administered in combination with estrogen/estradiol/estriol and/or progesterone/progestins to enhance the effectiveness of hormone replacement therapy or treatment of estrogen-induced endometrial hyperplasia or carcinoma.

Dosages employed in practicing the present invention will of course vary depending, e.g. on the particular disease or condition to be treated, the particular Compound of the Invention used, the mode of administration, and the therapy desired. Compounds of the Invention may be administered by any suitable route, including orally, parenterally, transdermally, or by inhalation, but are preferably administered orally. In general, satisfactory results, e.g. for the treatment of diseases as hereinbefore set forth are indicated to be obtained on oral administration at dosages of the order from about 0.01 to 2.0 mg/kg. In larger mammals, for example humans, an indicated daily dosage for oral administration will accordingly be in the range of from about 0.75 to 150 mg, conveniently administered once, or in divided doses 2 to 4 times, daily or in sustained release form. Unit dosage forms for oral administration thus for example may comprise from about 0.2 to 75 or 150 mg, e.g. from about 0.2 or 2.0 to 50, 75 or 100 mg of a Compound of the Invention, together with a pharmaceutically acceptable diluent or carrier therefor.

Pharmaceutical compositions comprising Compounds of the Invention may be prepared using conventional diluents or excipients and techniques known in the galenic art. Thus oral dosage forms may include tablets, capsules, solutions, suspensions and the like.

EXAMPLES

The synthetic methods for various Compounds of the Present Invention are illustrated below. Other compounds of the Invention and their salts may be made using the methods as similarly described below and/or by methods similar to those generally described in the detailed description and by methods known in the chemical art. The Compounds of the Invention can also be made by using general or specific synthetic methods disclosed in U.S. Provisional Application No. 61/235,888, filed Aug. 21, 2009, the contents of which are hereby incorporated by reference in their entirety

Example 1 6-(4-(6-fluoropyridin-2-yl)benzyl)-1-isobutyl-3-methyl-7-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1) 1-isobutyl-3-methylpyrimidine-2,4(1H,3H)-dione

A suspension of 3-Methyluracil (3.0 mg, 23.8 mmol), isobutyl iodide (7 mL, 60 mmol) and cesium carbonate (11.6 g, 35.7 mmol) in DMF (30 mL) is stirred at room temperature over a weekend. Solvent is removed under vacuum. The residue is treated with water, and then extracted with dichloromethane four times. The combined organic phase is washed with brine, dried over anhydrous sodium sulfate, and then filtered through a short silica gel column. The filtrate is concentrated to dryness to give product as off white solids, which is used for the next reaction without further purification. MS (ESI) m/z 183.1 [M+H]⁺.

2) 1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

Sodium hydride (95%, 1.74 g, 69 mmol) is suspended in 20 mL of anhydrous THF, and then a mixture of 1-isobutyl-3-methylpyrimidine-2,4(1H,3H)-dione (approx. 23 mmol) and p-toluenesulfonylmethyl isocyanide (97%, 7.0 g, 35 mmol) in 20 mL of anhydrous THF is added dropwise over 80 minutes at 0° C. The mixture is stirred at room temperature for an hour after the completion of the addition, and then carefully quenched with water. The mixture is diluted with 50 mL of saturated NaHCO₃, and then extracted with CH₂Cl₂ five times. The combined organic phase is washed with brine, and then dried with anhydrous Na₂SO₄. After filtration, the filtrate is evaporated to dryness under reduced pressure to give product as light brown solids, which is used for the next reaction without further purification. MS (ESI) m/z 222.2 [M+H]⁺.

3) 6-(4-(6-fluoropyridin-2-yl)benzyl)-1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

A suspension of 1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (540 mg, 2.46 mmol), 2-(4-(chloromethyl)phenyl)-6-fluoropyridine (0.60 g, 2.7 mmol) and cesium carbonate (1.6 g, 4.9 mmol) in anhydrous DMF is stirred at room temperature for 10 minutes. The mixture is diluted with 200 mL of water, and then extracted with CH₂Cl₂ three times. The combined organic phase is washed with brine, and then dried with anhydrous Na₂SO₄. After filtration, the filtrate is concentrated under vacuum. The residue is purified by silica gel chromatography to give product as pale yellow solids (705 mg, yield: 71%). MS (ESI) m/z 407.2 [M+H]⁺.

4) 7-chloro-6-(4-(6-fluoropyridin-2-yl)benzyl)-1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

6-(4-(6-fluoropyridin-2-yl)benzyl)-1-isobutyl-3-methyl-1H-pyrrolo [3,4-d]pyrimidine-2,4(3H,6H)-dione (81 mg, 0.2 mmol) is dissolved in a mixture of CCl₄ and DMF (3/1, v/v), and then N-chlorosuccinimide (27 mg, 0.2 mmol) is added. The reaction mixture is heated in a Biotage microwave at 100° C. for 30 minutes. Solvents are removed under vacuum, and the residue is purified by a semi-preparative HPLC to give pure product as off white solids (50 mg, yield 70%). MS (ESI) m/z 441.2 [M+H]⁺.

5) 7-chloro-6-(4-(6-fluoropyridin-2-yl)benzyl)-1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

7-chloro-6-(4-(6-fluoropyridin-2-yl)benzyl)-1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (22 mg, 0.05 mmol) is dissolved in anhydrous CH₂Cl₂, and then trichloroacetic acid (8.2 mg, 0.05 mmol) was added, followed by aniline (14 μL, 0.15 mmol). The reaction mixture is heated in a Biotage microwave instrument at 100° C. for 2 hours. The mixture is purified by a semi-preparative HPLC to give 6 mg of product as pale yellow solids. MS (ESI) m/z 498.3 [M+H]⁺.

Example 2 6-(4-(6-fluoropyridin-2-yl)benzyl)-3-methyl-1-neopentyl-7-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein neopentyl iodide is used in step 1 instead of isobutyl iodide. MS (ESI) m/z 416.2 [M+H]⁺.

Example 3 1-Isobutyl-6-(4-methoxybenzyl)-3-methyl-7-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein 1-(chloromethyl)-4-methoxybenzene is used in step 3 instead of 2-(4-(chloromethyl)phenyl)-6-fluoropyridine. MS (ESI) m/z 433.2 [M+H]⁺.

Example 4 7-(2,5-dioxopyrrolidin-1-yl)-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1) 1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

A suspension of 1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (100 mg, 0.45 mmol), 2-(4-(bromomethyl)phenyl)pyridine (160 mg, 0.65 mmol) and potassium carbonate (120 mg, 0.87 mmol) in anhydrous DMF is stirred at room temperature overnight. After routine workup, the obtained crude product is purified by a semi-preparative HPLC to give pure product as white solids. MS (ESI) m/z 389.2 [M+H]⁺.

2) 7-(2,5-dioxopyrrolidin-1-yl)-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (186 mg, 0.48 mmol) is dissolved in a mixture of CCl₄ and DMF (3/1, v/v), and then N-chlorosuccinimide (67 mg, 0.51 mmol) is added. The reaction mixture is heated in a Biotage microwave at 100° C. for 30 min. Solvents are removed under vacuum, and the residue is purified by a semi-preparative HPLC to give pure product as white solids (40 mg, yield 20%). MS (ESI) m/z 486.2 [M+H]⁺.

Example 5 1-Isobutyl-6-(4-methoxybenzyl)-3-methyl-5-(phenylamino)-1H-pyrrolo [3,4-d]pyrimidine-2,4(3H,6H)-dione

1) 5-chloro-1-isobutyl-6-(4-methoxybenzyl)-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1-isobutyl-6-(4-methoxybenzyl)-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (106 mg, 0.3 mmol) and hexachloro ethane (368 mg, 1.55 mmol) are dissolved in anhydrous THF, and then 1.0M LiHMDS in THF (0.6 mL, 0.6 mmol) is added dropwise. The reaction mixture is stirred at room temperature for an hour, and then quenched with saturated ammonium chloride aqueous solution. The mixture is purified by silica-gel column chromatography to give 60 mg of pure product (yield: 51%). MS (ESI) m/z 376.1 [M+H]⁺.

2) 1-Isobutyl-6-(4-methoxybenzyl)-3-methyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

5-chloro-1-isobutyl-6-(4-methoxybenzyl)-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (14 mg, 0.025 mmol) is placed in a Biotage microwave tube, and then aniline (0.5 mL, 5.4 mmol) is added. The mixture was heated at 180° C. for 4 h. The mixture is purified by a semi-preparative HPLC to give 13 mg of pure product (yield: 81%). MS (ESI) m/z 433.2 [M+H]⁺.

Example 6 6-((4-Pyridin-2yl)-benzyl)-1-isobutyl-3-methyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1) 5-chloro-1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

To a solution of 5-chloro-1-isobutyl-6-(4-methoxybenzyl)-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (14 mg, 0.032 mmol) in CH₂Cl₂ (0.5 mL) is added TFA (100 μL) and TFMSA (50 μL). The mixture is stirred at r.t. for 2 h, and then carefully basified with saturated NaHCO₃ aqueous solution, followed by extractions with CH₂Cl₂. The combined organic phase is dried over sodium sulfate, filtered, and concentrated to dryness under reduced pressure to give crude product, which is used in the next step without further purification. MS (ESI) m/z 256.1 [M+H]⁺.

2) 5-chloro-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

A suspension of crude 5-chloro-1-isobutyl-3-methyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (0.032 mmol), 2-(4-(chloromethyl)phenyl)pyridine (9.7 mg, 0.048 mmol) and cesium carbonate (15.6 mg, 0.048 mmol) in anhydrous DMF is stirred at room temperature for 3 h, and then diluted with saturated NaHCO₃ aqueous solution, followed by extractions with CH₂Cl₂. The combined organic phase is dried over sodium sulfate, filtered, and concentrated to dryness under reduced pressure to give crude product, which is used in the next step without further purification. MS (ESI) m/z 423.1 [M+H]⁺.

3) 6-((4-Pyridin-2yl)-benzyl)-1-isobutyl-3-methyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

Crude 5-chloro-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (0.032 mmol) is placed in a Biotage microwave tube, and then aniline (0.2 mL) is added. The mixture is heated at 150° C. for an hour, and then purified by a semi-preparative HPLC to give 7 mg of pure product (overall yield:46%). MS (ESI) m/z 480.2 [M+H]⁺.

Example 7 1-isobutyl-3-methyl-7-(phenylamino)-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein 2-(4-(chloromethyl)phenyl)pyridine is used in step 3 instead of 2-(4-(chloromethyl)phenyl)-6-fluoropyridine. MS (ESI) m/z 480.2 [M+H]⁺.

Example 8 7-(3-fluorophenylamino)-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein 2-(4-(chloromethyl)phenyl)pyridine is used in step 3 instead of 2-(4-(chloromethyl)phenyl)-6-fluoropyridine, and 3-fluorobenzenamine is used in step 5 instead of aniline. MS (ESI) m/z 498.2 [M+H]⁺.

Example 9 1-isobutyl-3-methyl-7-(methyl(phenyl)amino)-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein 2-(4-(chloromethyl)phenyl)pyridine is used in step 3 instead of 2-(4-(chloromethyl)phenyl)-6-fluoropyridine, and N-methyl benzenamine is used in step 5 instead of aniline. MS (ESI) m/z 494.3 [M+H]⁺.

Example 10 6-(4-(1H-1,2,4-triazol-1-yl)benzyl)-1-isobutyl-3-methyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 1-(4-(bromomethyl)phenyl)-1H-1,2,4-triazole is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine. MS (ESI) m/z 470.2 [M+H]⁺.

Example 11 1-isobutyl-6-(4-methoxybenzyl)-3,7-dimethyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1) 1-isobutyl-3,7-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

Sodium hydride (95%, 116 mg, 4.6 mmol) is suspended in 10 mL of anhydrous THF, and then a mixture of 1-isobutyl-3-methylpyrimidine-2,4(1H,3H)-dione (300 mg, 1.65 mmol) and 1-(p-toluenesulfonyl)-ethyl isocyanide (413 mg, 1.98 mmol) in 5 mL of anhydrous THF is added dropwise over 1 h at 0° C. The mixture is stirred at room temperature for 3 h at room temperature after the completion of the addition, and then carefully quenched with water. The mixture is diluted with saturated NaHCO₃, and then extracted with CH₂Cl₂ five times. The combined organic phase is washed with brine, and then dried with anhydrous Na₂SO₄. After filtration, the filtrate is evaporated to dryness under reduced pressure, and the residue is purified by basic alumina column chromatography to give 247 mg of product (yield: 64%). MS (ESI) m/z 236.1 [M+H]⁺.

2) 1-isobutyl-6-(4-methoxybenzyl)-3,7-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

A suspension of 1-isobutyl-3,7-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (78 mg, 0.33 mmol), 1-(chloromethyl)-4-methoxybenzene (88 μL, 0.63 mmol) and cesium carbonate (344 mg, 1.06 mmol) in anhydrous DMF is stirred at room temperature overnight. The mixture is diluted with 30 mL of water, and then extracted with CH₂Cl₂ three times. The combined organic phase is washed with brine, and then dried with anhydrous Na₂SO₄. After filtration, the filtrate is concentrated under vacuum. The residue is purified by basic alumina column chromatography to give 110 mg of product (yield: 93%). MS (ESI) m/z 356.2 [M+H]⁺.

3) 5-chloro-1-isobutyl-6-(4-methoxybenzyl)-3,7-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

1-isobutyl-6-(4-methoxybenzyl)-3,7-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (103 mg, 0.29 mmol) and hexachloroethane (400 mg, 1.7 mmol) are dissolved in anhydrous THF, and then 1.0M LiHMDS in THF (1.4 mL, 1.4 mmol) is added dropwise. The reaction mixture is stirred at room temperature for an hour, and then quenched with saturated ammonium chloride aqueous solution. The mixture is purified by silica-gel column chromatography to give pure product as off-white solids (yield: 64%). MS (ESI) m/z 390.2 [M+H]⁺.

4) 1-isobutyl-6-(4-methoxybenzyl)-3,7-dimethyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

5-chloro-1-isobutyl-6-(4-methoxybenzyl)-3,7-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione (12 mg, 0.03 mmol) is placed in a Biotage microwave tube, and then aniline (0.22 mL) is added. The mixture was heated at 150° C. for 3 h., and then purified by a semi-preparative HPLC to give 4 mg of pure product. MS (ESI) m/z 447.3 [M+H]⁺.

Example 12 1-isobutyl-3-methyl-6-(4-(1-methylpyrrolidin-2-yl)benzyl)-5-(phenylamino)-1H-pyrrolo [3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein tert-butyl 2-(4-(bromomethyl)phenyl)pyrrolidine-1-carboxylate is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine. The obtained tert-butyl 2-(4-((5-chloro-1-isobutyl-3-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrrolo[3,4-d]pyrimidin-6-yl)methyl)phenyl)pyrrolidine-1-carboxylate is deprotected with TFA in CH₂Cl₂ at room temperature to give 5-chloro-1-isobutyl-3-methyl-6-(4-(pyrrolidin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione, which is N-methylated with 37% formaldehyde aqueous solution and sodium borohydride in methanol at room temperature to give 5-chloro-1-isobutyl-3-methyl-6-(4-(1-methylpyrrolidin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione in a good overall yield. The obtained intermediate reacts with aniline using the procedure described in step 3 of EXAMPLE 6 to give pure product after HPLC purification. MS (ESI) m/z 486.3 [M+H]⁺.

Example 13 1-isobutyl-3-methyl-5-(phenylamino)-6-(4-(pyridin-4-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 4-(4-(chloromethyl)phenyl)pyridine is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine. MS (ESI) m/z 480.3 [M+H]⁺.

Example 14 6-(4-(1H-imidazol-1-yl)benzyl)-1-isobutyl-3-methyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 1-(4-(chloromethyl)phenyl)-1H-imidazole is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine. MS (ESI) m/z 469.3 [M+H]⁺.

Example 15 7-(4-hydroxyphenylamino)-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein 2-(4-(chloromethyl)phenyl)pyridine is used in step 3 instead of 2-(4-(chloromethyl)phenyl)-6-fluoropyridine, and 4-aminophenol is used in step 5 instead of aniline. MS (ESI) m/z 496.2 [M+H]⁺.

Example 16 1-isobutyl-3-methyl-5-(methyl(phenyl)amino)-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein N-methyl benzenamine is used in step 3 instead of aniline. MS (ESI) m/z 494.3 [M+H]⁺.

Example 17 1-isobutyl-3-methyl-5-(phenylamino)-6-(4-(trifluoromethyl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 1-(bromomethyl)-4-(trifluoromethyl)benzene is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine. MS (ESI) m/z 471.2 [M+H]⁺.

Example 18 5-(4-fluorophenylamino)-1-isobutyl-3-methyl-6-(4-(pyridin-2-yl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 4-fluorobenzenamine is used in step 3 instead of aniline. MS (ESI) m/z 498.3 [M+H]⁺.

Example 19 1-isobutyl-3-methyl-7-(phenylamino)-6-(4-(trifluoromethyl)benzyl)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 1 wherein 1-(bromomethyl)-4-(trifluoromethyl)benzene is used in step 3 instead of 2-(4-(chloromethyl)phenyl)-6-fluoropyridine. MS (ESI) m/z 471.2 [M+H]⁺.

Example 20 6-(4-(1H-1,2,4-triazol-1-yl)benzyl)-1-isobutyl-3,7-dimethyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 11 wherein 1-(4-(bromomethyl)phenyl)-1H-1,2,4-triazole is used in step 2 instead of 1-(chloromethyl)-4-methoxybenzene, and NCS chlorination method is used in step 3 instead of the hexachloroethane and LiHMDS method. MS (ESI) m/z 484.3 [M+H]⁺.

Example 21 6-(4-(1H-pyrazol-1-yl)benzyl)-1-isobutyl-3-methyl-5-(phenylamino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 1-(4-(bromomethyl)phenyl)-1H-pyrazole is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine. MS (ESI) m/z 469.3 [M+H]⁺.

Example 22 6-(4-(1H-imidazol-1-yl)benzyl)-1-isobutyl-3-methyl-5-(methyl(phenyl)amino)-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-dione

The synthetic procedure of this compound is analogous to EXAMPLE 6 wherein 1-(4-(chloromethyl)phenyl)-1H-imidazole is used in step 2 instead of 2-(4-(chloromethyl)phenyl)pyridine, and N-methylbenzenamine is used in step 3 instead of aniline. MS (ESI) m/z 483.3 [M+H]⁺.

Example 23 Measurement of PDE1B Inhibition In Vitro Using IMAP Phosphodiesterase Assay Kit

Phosphodiesterase 1B (PDE1B) is a calcium/calmodulin dependent phosphodiesterase enzyme that converts cyclic guanosine monophosphate (cGMP) to 5′-guanosine monophosphate (5′-GMP). PDE1B can also convert a modified cGMP substrate, such as the fluorescent molecule cGMP-fluorescein, to the corresponding GMP-fluorescein. The generation of GMP-fluorescein from cGMP-fluorescein can be quantitated, using, for example, the IMAP (Molecular Devices, Sunnyvale, Calif.) immobilized-metal affinity particle reagent.

Briefly, the IMAP reagent binds with high affinity to the free 5′-phosphate that is found in GMP-fluorescein and not in cGMP-fluorescein. The resulting GMP-fluorescein—IMAP complex is large relative to cGMP-fluorescein. Small fluorophores that are bound up in a large, slowly tumbling, complex can be distinguished from unbound fluorophores, because the photons emitted as they fluoresce retain the same polarity as the photons used to excite the fluorescence.

In the phosphodiesterase assay, cGMP-fluorescein, which cannot be bound to IMAP, and therefore retains little fluorescence polarization, is converted to GMP-fluorescein, which, when bound to IMAP, yields a large increase in fluorescence polarization (Δmp). Inhibition of phosphodiesterase, therefore, is detected as a decrease in Δmp.

Enzyme Assay

Materials: All chemicals are available from Sigma-Aldrich (St. Louis, Mo.) except for IMAP reagents (reaction buffer, binding buffer, FL-GMP and IMAP beads), which are available from Molecular Devices (Sunnyvale, Calif.).

Assay: 3′,5′-cyclic-nucleotide-specific bovine brain phosphodiesterase (Sigma, St. Louis, Mo.) is reconstituted with 50% glycerol to 2.5 U/ml. One unit of enzyme will hydrolyze 1.0 μmole of 3′,5′-cAMP to 5′-AMP per min at pH 7.5 at 30° C. One part enzyme is added to 1999 parts reaction buffer (30 μM CaCl₂, 10 U/ml of calmodulin (Sigma P2277), 10 mM Tris-HCl pH 7.2, 10 mM MgCl₂, 0.1% BSA, 0.05% NaN₃) to yield a final concentration of 1.25 mU/ml. 99 μl of diluted enzyme solution is added into each well in a flat bottom 96-well polystyrene plate to which 1 μl of test compound dissolved in 100% DMSO is added. Selected Compounds of the Invention are mixed and pre-incubated with the enzyme for 10 min at room temperature.

The FL-GMP conversion reaction is initiated by combining 4 parts enzyme and inhibitor mix with 1 part substrate solution (0.225 μM) in a 384-well microtiter plate. The reaction is incubated in dark at room temperature for 15 min. The reaction is halted by addition of 60 μl of binding reagent (1:400 dilution of IMAP beads in binding buffer supplemented with 1:1800 dilution of antifoam) to each well of the 384-well plate. The plate is incubated at room temperature for 1 hour to allow IMAP binding to proceed to completion, and then placed in an Envision multimode microplate reader (PerkinElmer, Shelton, Conn.) to measure the fluorescence polarization (Δmp).

A decrease in GMP concentration, measured as decreased Δmp, is indicative of inhibition of PDE activity. IC₅₀ values are determined by measuring enzyme activity in the presence of 8 to 16 concentrations of compound ranging from 0.0037 nM to 80,000 nM and then plotting drug concentration versus ΔmP, which allows IC₅₀ values to be estimated using nonlinear regression software (XLFit; IDBS, Cambridge, Mass.).

The Compounds of the Invention are selected and tested in this assay to show PDE1 inhibitory activity. Exemplified compounds of the invention generally have IC₅₀ values of 25 μM, some less than 1 μM, some less than 500 nM, some less than 200 nM, some with PDE1A activities, e.g., Examples 1-3, 5 and 6 are shown to have an IC₅₀ of less than 200 nM.

Example 24 PDE1 Inhibitor Effect on Sexual Response in Female Rats

The effect of PDE1 inhibitors on Lordosis Response in female rats is measured as described in Mani, et al., Science (2000) 287: 1053. Ovariectomized and cannulated wild-type rats are primed with 2 μg estrogen followed 24 hours later by intracerebroventricular (icv) injection of progesterone (2 μg), PDE1 inhibitors of the present invention (0.1 mg, 1.0 mg or 2.5 mg) or sesame oil vehicle (control). The rats are tested for lordosis response in the presence of male rats. Lordosis response is quantified by the lordosis quotient (LQ=number of lordosis/10 mounts×100). The LQ for estrogen-primed female rats receiving Compounds of the Invention, at 0.1 mg, will likely be similar to estrogen-primed rats receiving progesterone and higher than for estrogen-primed rats receiving vehicle. 

What is claimed is:
 1. The Compound of formula II-A:

wherein (i) Q is —C(═S)—, —C(═O)—, —C(═N(R₇))— or —C(R₁₄)(R₁₅)—; (ii) R₁ is H or C₁₋₆ alkyl: (iii) R₂ is H, C₁₋₆ alkyl wherein said alkyl group is optionally substituted with halo or hydroxy, N(R₁₄)(R₁₅)—C₁₋₆alkyl, arylC₀₋₆alkyl, heteroarylC₀₋₆alkyl, C₁₋₆alkoxyarylC₁₋₆alkyl; -G-J wherein: G is a single bond or C₁₋₆alkylene; J is C₃₋₈cycloalkyl or heteroC₃₋₈cycloalkyl optionally substituted with one or more C₁₋₆alkyl, or amino; (iv) R₃ is 1) -D-E-F wherein: D is methylene; E is phenylene, wherein the phenylene group is optionally substituted with halo; F is H, halo, C₁₋₆alkyl, aryl, or C₃₋₈cycloalkyl optionally containing at least one atom selected from a group consisting of N or O, and said cycloalkyl is optionally substituted with C₁₋₆alkyl, heteroaryl optionally substituted with C₁₋₆alkyl, wherein said heteroaryl is optionally substituted with halo or haloC₁₋₆alkyl; amino, C₁₋₆alkoxy, O-halo C₁₋₆alkyl, C₁₋₆alkylsulfonyl, C(O)—R₁₃, —N(R₁₄)(R₁₅); or 2) attached to the nitrogen on the pyrrolo portion of Formula II and is a moiety of Formula A

wherein X, Y and Z are C, and R₈, R₉, R₁₁ and R₁₂ are independently H or halogen; and R₁₀ is halogen, C₁₋₆alkyl, C₁₋₆alkoxy, C₃₋₈cycloalkyl, heteroC₃₋₈cycloalkyl haloC₁₋₆alkyl, aryl, heteroaryl, C₁₋₆alkyl sulfonyl, arylcarbonyl, heteroarylcarbonyl, alkoxycarbonyl, aminocarbonyl; wherein the aryl, heteroaryl, cycloalkyl or heterocycloalkyl is optionally substituted with one or more C₁₋₆alkyl haloC₁₋₆alkyl, hydroxy, carboxy, —SH, or an additional aryl or heteroaryl; (v) R₄ and R₅ are independently H, C₁₋₆alkyl, C₃₋₈cycloalkyl, C₃₋₈heterocycloalkyl, aryl or heteroaryl wherein said aryl or heteroaryl is optionally substituted with halo, hydroxy, C₁₋₆alkyl, C₁₋₆alkoxy or another aryl group; (vi) R₆ is H, C₁₋₆alkyl, hydroxy, C₁₋₆alkoxy, aryloxy, —N(R₁₆)(R₁₇), oxo, or C₃₋₈cycloalkyl; (vii) R₇ is H, C₁₋₆alkyl C₃₋₈cycloalkyl wherein said cycloalkyl is optionally substituted with one or more oxo; (viii) R₁₃ is —N(R₁₄)(R₁₅), C₁₋₆alkyl, —OC₁₋₆alkyl, haloC₁₋₆alkyl, aryl, or heteroaryl; and (ix) R₁₄ and R₁₅ are independently H or C₁₋₆alkyl; (x) R₁₆ and R₁₇ are independently H, C₁₋₆alkyl, aryl, heteroaryl, wherein said aryl or heteroaryl is optionally substituted with, C₁₋₆alkoxy; in free or salt form.
 2. The compound according to claim 1, which is the compound:

in free or salt form.
 3. The compound according to claim 1, selected from any of the following:

in free or salt form.
 4. The compound according to claim 1, selected from any of the following:

in free or salt form.
 5. The compound according to claim 1, wherein Q is —(C═O)—, in free or salt form.
 6. The compound according to claim 5, wherein R₂ is C₁₋₆alkyl, in free or salt form.
 7. The compound according to claim 5, wherein R₂ is isobutyl or 2,2-dimethylpropyl, in free or salt form.
 8. The compound according to claim 6, wherein R₄ or R₅ is H or C₁₋₆alkyl, in free or salt form.
 9. The compound according to claim 6, wherein R₄ or R₅ is phenyl, free or salt form.
 10. The compound according to claim 6, wherein R₄ is H and R₅ is phenyl optionally substituted with halo, hydroxy, C₁₋₆alkyl, C₁₋₆alkoxy or another aryl, in free or salt form.
 11. The compound according to claim 10, wherein R₃ is attached to the nitrogen on the pyrrolo portion of Formula II-A and is a moiety of Formula A

wherein X, Y and Z are C, and R₈, R₉, R₁₁ and R₁₂ are independently H or halogen; and R₁₀ is phenyl, pyridyl, piperidinyl or pyrrolidinyl optionally substituted with halo or C₁₋₆alkyl, in free or salt form.
 12. The compound according to claim 11, wherein R₇ is H or C₁₋₆alkyl, in free or salt form.
 13. The compound according to claim 1 selected from any of the following:

in free or salt form.
 14. The compound according to claim 1, wherein said compound is a compound of Formula P-A:

wherein: (i) X═O; (ii) R₁ is C₁₋₆alkyl; (iii) R₂ is C₁₋₆alkyl; (iv) R₃ is a moiety of Formula A:

wherein X, Y, Z are C, R₈, R₉, R₁₁ and R₁₂ are independently H or halogen and R₁₀ is C₁₋₆alkoxy, aryl or heteroaryl wherein said aryl and heteroaryl are independently and optionally substituted with one or more halo; heteroC₃₋₈cycloalkyl-C₀₋₆alkyl wherein said heterocycloalkyl is optionally substituted with one or more C₁₋₆alkyl; (v) R₄ is aryl optionally substituted with one or more halo, hydroxy and/or another aryl; (vi) R₅ is H; (vii) R₆ is H, in free or salt form.
 15. The compound according to claim 1, wherein said compound is a compound of Formula P-A:

wherein: (i) X═O; (ii) R₁ is methyl; (iii) R₂ is C₁₋₆alkyl; (iv) R₃ is a moiety of Formula A:

wherein X, Y, Z are C, R₈, R₉, R₁₁ and R₁₂ are independently H or halogen and R₁₀ is aryl or heteroaryl wherein said aryl and heteroaryl are independently and optionally substituted with one or more halo; or heteroC₃₋₈cycloalkyl-C₀₋₆alkyl wherein said heterocycloalkyl is optionally substituted with one or more C₁₋₆alkyl; (v) R₄ is phenyl optionally substituted with one or more halo, hydroxy and/or another aryl; (vi) R₅ is H; (vii) R₆ is H, in free or salt form.
 16. The compound according to claim 15 which is the compound:

in free or salt form.
 17. A pharmaceutical composition comprising a compound according to claim 1, in free or pharmaceutically acceptable salt form, in admixture with a pharmaceutically acceptable diluent or carrier.
 18. The method of treating a condition, comprising administering a therapeutically effective amount of a compound according to claim 1, in free or pharmaceutically acceptable salt form, to a patient in need of such treatment, wherein said condition is female sexual dysfunction.
 19. The method of claim 18, further comprising administering a compound or compounds selected from a group consisting of estradiol, estriol, estradiol esters, progesterone and progestins to a patient in need thereof. 